The Riftbreaker: Heart of the Swamp

1. Summary

Heart of the Swamp drops Ashley and Mr. Riggs into a fungal swamp where most of the map is mud and water you cannot build on, and a lot of the discussion turns on that choice. Supporters call it a space puzzle that forces new strategies. Critics say it removes the base building they bought the game for.

The story, the price and the expansion's place among the three DLCs divide reviewers as well. Fans enjoy the banter between Ashley and Mr. Riggs, while detractors find the writing weak and the ending choice pointless. Some call it easily worth $10, others too short for the money, and roughly as many reviewers call it the best of the three DLCs as call it the worst. The praise that comes from both sides goes to the new towers and walls, especially the floating towers that sit on liquid. Players also like the colorful swamp and its music, and the Canceroth, a new enemy that climbs over walls.

Complaints about the missions are specific: slow movement through mud, thorn fields that have to be burned, a mining section and long pipe runs. Some players find resin, the new resource, redundant next to plasma, and several judge the new weapons weaker than older gear at endgame. In the first weeks after launch, crashes and freezes added to the negative reviews, though one reviewer later updated to say their crash had been fixed. Steam's all-language rating is Mixed, a little lower than the Mostly Positive English one this verdict reads.

2. What keeps coming up

What players praise

New towers and walls, led by the floating towersHigh

The tech unlocks draw steady praise, and the floating towers that can be built on water and mud lead it: "Floating Towers are god-tier." Players also single out the oversize towers (the HCM missile silo, the heavy artillery, the Piercer) and the regenerating vine walls, which one detailed review rates as "BY FAR the best in the game" because they also work as gates. Two reviewers add that the floating towers pay off outside the swamp: one found them useful on Metal Terror's maps, and the other says they make Metal Terror much easier because they can be built on Morphium.

The praise has limits. One player points out the swamp towers have no upkeep and make defense easier than it should be, another calls the new towers "nearly useless" against long-range enemies, and the vine walls draw both "incredibly convenient" and "insultingly bad" verdicts. Two players also want walls that can go on liquid.

A colorful swamp with good musicMedium

Players who mention the setting mostly like it: "The swamp has a great atmosphere, music fits so well," and several describe it as surprisingly bright and pretty, with the giant mushroom tree as its centerpiece. One negative review concedes the visuals are the one thing it has going for it. A small minority finds the biome too close to the existing jungle, or the map simply average.

Tough waves and the CancerothMedium

The Canceroth, a corruption-spreading monster that climbs over walls, gets the most attention among the new enemies: "these guys actually provide a legitimate threat to your base." Reviewers who wanted a challenge describe losing well-defended outposts, late areas that stay hard even with endgame gear, and a biome that is "extremely unforgiving, especially in survival." One reviewer flags heavy ranged and artillery waves that pick off deployable towers as a balance issue. A few players who came in with old saves and upgraded weapons from the other DLCs finished it easily and felt the final assault lacked threat.

Where players are split

Building on tiny islands surrounded by waterHigh

At least 14 reviews discuss the limited building space, and they divide on it. Supporters call the limited land "a fresh take on base building and a space saving puzzle to solve," and say expanding the main map as you progress and fighting for new ground makes each foothold feel earned. Critics find it the expansion's main irritation: "You can't build on water," even though the water is shallow enough to walk through. One asks why there is no water foundation when sand and acid have one, another why a technologically advanced species is "unable to build in ankle deep water," and a third says the DLC "took away everything that is fun about this game." Some positive reviews list the lack of space as their only complaint.

Price and lengthHigh

Roughly as many reviews say the expansion is worth the money as call it short, thin or overpriced. On one side: "Pretty shallow for the 10€," "Way too short," finished "in few hours," or worth buying only on sale. On the other: "Easily worth the $10," a decent number of extra campaign hours, and one estimate of 6 to 8 hours that makes it the longest of the three DLCs. The few reviewers who give a completion time put it at about 4 to 8 hours, so the disagreement is less about length than about whether those hours feel fresh.

Story and writingMedium

Fans like the banter between Ashley and Mr. Riggs, call the story "unusually well written," and enjoy its focus on restoring an ecosystem instead of fighting a conspiracy. Detractors call the dialogue weak or "awful," object that the conservation-minded Ashley now burns the swamp and sets off nukes, and see the save-or-kill-the-tree finale as hollow: "the choice at the end of whether to save or kill the tree literally does nothing." Some positive reviews make the same point about the two endings barely differing.

Best or worst of the three DLCsMedium

Reviewers often rank it against Metal Terror and Into the Dark, and they land on both ends. Some call it "Best DLC out of the trio" or "the most worthwhile of the three," usually for its unlocks or for a campaign that feels like a campaign. A similar number call it the worst, saying the other two had stronger stories and more interesting missions. Several positive reviews push back on the rating itself ("Not sure where all the hate comes from"), and one reviewer says they expected the DLC to be bad because of the negative reviews.

Poogrets and feeding the swamp creaturesLow

The Poogrets, creatures you feed to progress some objectives, polarize players. Some adore them ("Also, Poogrets are the best."), while others call feeding a creature so it can "fart and poop" for an objective childish, or simply say "Poogrets are a worthless addition."

What frustrates players

Tedious missions and slow movement through mudMedium

Negative reviews often describe the campaign as tedious or a slog. Players cite long resin pumping missions, a mining section that recalls Into the Dark, regrowing thorn fields that must be burned, and long pipe runs between scattered islands. Mud slows the mech down, and one review asks for "an upgrade to traverse the liquid portions faster considering 90% of the map is just mud pools." Another objects to the map changing size several times and to an outpost being deleted after the player had built on it, calling it padding. Fans counter that the missions are varied, with more new objective types than earlier DLCs.

Crashes, freezes and broken systems at launchMedium

12 reviews report technical problems, most of them written in the first three weeks after launch: crashes every 30 minutes, crashes when loading saves, stuttering, a nest spawning outside the map, slowdowns in large thorn fields, and broken water pipes and orbital artillery. Two of them stress they ran no mods, and one requested a refund. Others reported no issues at all. One player who crashed on every save load later updated their review to say the crash had been fixed, and later bug reports are scattered (a crash near a special plant on the second map, freezes in certain areas).

Resin and the new weapons feel redundantLow

Several players who mention resin, the new liquid resource, see it as pointless because plasma is already plentiful by the time it unlocks: "Resin is worthless when you transition into Fusion power." One reviewer calls it amazingly useful. The new player weapons get similar criticism, judged weaker than gear from the earlier DLCs at endgame, with the Tornado skill and the Root Gun as the usual exceptions.

Outpost cap and co-op ownershipLow

A couple of reviews raise system limits: players with every DLC can hit the 12-outpost cap before reaching the swamp, and in co-op both host and client need the DLC, with DLC buildings reportedly left behind in vanilla games.

3. The player conversation

The tone is more ambivalent than angry. Several positive reviews hedge ("not bad, just not amazing," "I wish I could give it a neutral rating," "it's not great, it's just alright"), and several negative ones open by praising the base game and the other expansions before saying this one missed. A few reviewers, positive and negative, say they bought it partly to support the developers. Short one-word reviews and swamp jokes make up a good share of the page and carry little signal.

How players approached it shapes what they say. A few who brought in an endgame save with both earlier DLCs finished call it short and easy, though others with maxed gear still found the late areas hard. Complaints about water often come from players used to building freely anywhere, and the praise for the same feature comes from players who enjoy working within tight space.

In the first six weeks after launch 74% of reviews recommended it, with bug reports making up much of the negative side. Reviews in the rest of 2024 were the warmest (89%). From 2025 on the share fell to around 62%, and the complaints moved from crashes to design: building on water, tedious missions, resin, and the story. Reviews defending the expansion ("I don't get the negative reviews") also appear mostly from 2025 on.

4. What the developers could do

1. Let players build something on shallow water. One critic points out that a fusion reactor is possible but a concrete pylon on shallow water is not, and others ask for a water foundation or walls on liquid; a limited water foundation would answer them without removing the space puzzle its fans enjoy.
2. Speed up mud traversal and trim the padding missions. Slow movement through mud pools, long resin pumping and thorn burning, and outposts deleted after map changes are what the "slog" reviews describe.
3. Keep stability and performance under watch. Launch-window crashes, save-loading failures and thorn-field slowdowns account for much of the early negative side, and one player updated their review once the crash was fixed.
4. Give resin and the new weapons a real endgame role. Several players who discuss resin say it only duplicates plasma, and the new guns lose to older gear, so the unlocks feel like filler outside the floating towers.
5. Make the save-or-kill-the-tree choice matter. Both positive and negative reviews say the two endings barely differ, which undercuts a story that already divides players.
6. Tune scaling for endgame saves and ranged waves. A few players arriving with maxed gear found it too easy, while others report ranged and artillery enemies shredding deployables and upkeep-free towers that make defense easier than it should be.
7. Raise the outpost cap and ease co-op ownership. Players with every DLC can hit the 12-outpost limit before the swamp, and co-op requires both players to own the expansion.