The Binding of Isaac: Rebirth: The Binding of Isaac: Repentance+

Lag and input delay come up in 36% of longer reviews, more than any other problem, and most of those reviews complain about it. Players describe the online mode keeping everyone in sync by delaying every input, "giving everybody about half a second of input lag, akin to how most Nintendo online games work," and slowing the whole lobby to its worst connection, which one reviewer called "several minutes of The Binding of Powerpoint for everyone in the lobby." Hosts, players alone in an online lobby and friends who live in the same town report the delay too. In a game built on dodging projectiles, one reviewer wrote, "the input delay with this ruins the fun of it." 5% of longer reviews compare the mode with Steam Remote Play or Parsec, and most of them say the workaround played better: "Somehow official online has worse input lag than steam remote play." A smaller group pushes back, calling the delay tolerable, blaming slow connections, or reporting that it improved once an input delay setting arrived: "Finally they added a how much input lag option in the settings which is weird but it fixed the issue!" Lag mentions fell over time, from 53% of longer launch-week reviews to 16% of longer reviews written in 2026.

15% of longer reviews describe online runs breaking apart. A desync splits the lobby into separate solo games, a dropped player can only rejoin at the next floor ("you have to wait for the next FLOOR to reconnect"), and online runs are not saved. Reviewers name triggers such as holding R to restart, Ipecac and certain trinkets, and several describe crashes at the worst moment: "game CONSISTENTLY crashes when touching chest after defeating the final boss." In another run "the game crashed at the perfect moment during The Beast cutscene," and only the reviewer's friend got the achievement. "If the game is going to be unstable, it needs a quick-reconnect option," one player wrote. These reports did not fade with time: they went from 13% of longer launch-week reviews to 18% of longer reviews written in 2026.

5% of longer reviews report the game failing to start after installing Repentance+ or telling them to buy the earlier expansions, and the share rose to 9% of longer reviews written in 2026. A recurring group is players who claimed the free listing without owning Afterbirth, Afterbirth+ and Repentance: "the store page has it listed as free DLC to TBoI Rebirth, but it bricks your game if you do." One player's friend bought Afterbirth when a pop-up asked for it, and then "the pop-up changed to say Afterbirth+ was required." Another wrote that "new players constantly mess up and claim the dlc without noticing it requires previous dlc." Owners of every expansion report it too: "it launches a white screen for half a second then instantly closes. I have all the DLCs". Reviewers trade fixes such as unticking Repentance+ in the game's DLC properties, deleting its files or reinstalling, and several could not work out how to remove it at all.

Mod complaints appear in 12% of longer reviews, and more than half were written in launch week, when 17.5% of longer reviews raised them. Repentance+ moved the mod folder, changed the modding API and broke the community's Repentogon extender at launch; one reviewer called it "probably one of the worst things that has happened to modding this game since Afterbirth+ released." Online play also requires turning every mod off and restarting, even in a private lobby with friends, and a recurring request is an exception for client-side helpers: "QOL mods like EID or Planetarium Chance should be allowed since they help rather than add to the game." Some later and edited reviews say single-player mods work again ("now that the mods work native for single player i can recommend this to everyone"), and mod complaints fell to 7% of longer reviews written in 2026, though reviews from 2026 still ask for mods in online play.

Repentance+ copies the Repentance save the first time it is installed and keeps its own file after that, so progress made later in Repentance does not follow. One player's copy "did not update with any of my single-player progress following about 50 more hours of playtime." Others describe online sessions replacing their file ("The game overwrites your save with someone else's from multiplayer.") or crashes rolling progress back. Fixes circulate, such as syncing unlocks from Steam achievements in the Secrets menu, but one reviewer summed up the process: "getting your saves to transfer is like diffusing a bomb." A few defenders note that the game warns about the separate save at first launch.

7% of longer reviews say Repentance+ broke their controller, and the share rose to 15% of longer reviews written in 2026. The reports are specific: sticks rotated 90 degrees, the B button registering as a direction so menus cannot be exited, and a single pad detected as two players. A Steam Deck owner wrote: "Up was left, left was up, right was down and you cant pause!" Another found that "uninstalling the DLC fixed everything and made the game playable," a fix several others repeat. Some got their pad working through Steam Input settings or an older Proton version.

Players who stick with online play raise design problems. Treasure rooms give one item to the whole team while bosses drop one per player ("Bosses drop double loot so each player gets an item (free item rooms give 1 item only)."), so the best items pile onto one character. "for the love of god make item rooms have more than one item and the mode will be fun," one reviewer asked. Identical characters are hard to tell apart, public lobbies bring players who grab items and leave, the online daily run cannot be played with friends only ("PLEASE LET US PLAY THE DAILY CHALLENGE WITH JUST OUR FRIENDS WITHOUT RANDOM PEOPLE JOINING"), and the chat filter blocks mild swearing in an M-rated game.

A smaller group reports the add-on running hotter and slower than Repentance even in single player. One measured "Constant 93 degrees on CPU for no reason (compared to 50-55 on regular Repentance)", and others describe fans ramping up at launch and frame drops on the first floor.

4% of longer reviews bring up the three online achievements and the online completion marks. Some object that these put full completion of a long single-player game behind an online mode ("Please remove multiplayer-only achievements," one player asked), and others report achievements failing to unlock after an online win.

Repentance+ has no macOS version, and Mac owners say the store does not make that clear: "does not work on mac. this information is not easy to find." It also shipped in English only and dropped the translations Repentance had. "I'm stuck on repentance because translations were removed in this DLC," one reviewer wrote, and Chinese is the language reviewers ask for most often.