Cassette Beasts is a role-playing video game developed by Bytten Studio and published by Raw Fury.

[2] The game includes a permadeath mode, where monsters that are defeated permanently die in the playthrough, and a map randomizer, to increase replayability.

[4] The player meets a number of companions during the game, and can strengthen their relationship with them by battling alongside them, completing their quests, and talking to them at a campfire while resting.

[6][9] Cassette Beasts was developed by UK-based Bytten Studio, a company of two full-time staff, Jay Baylis and Tom Coxon.

[10] They also had an animator, a character illustrator, and a musician (Jay's brother, Joel) who worked on development of the game part-time.

[8] Baylis and Coxon designed the game to be targeted at adults who had grown up with Pokémon and may be looking for a deeper story and more complex gameplay mechanics.

[8] The combat in the game was inspired by Final Fantasy and Dragon Quest, specifically the aspects where status effects can halt momentum in battle.

[16] The update to Cassette Beasts adding cross-platform multiplayer was released on May 20 for PC, Xbox, and Nintendo Switch.

[3] RPG Fan's Des Miller felt that the game's Pokémon inspiration was obvious, but that it was unique because of "its aesthetic, design, and most importantly, its heart".

[2] Rock, Paper, Shotgun's Katharine Castle noted that it was a Pokémon game for adults, describing it as an "evolutionary offshoot" of the series.

[6] Ellis agreed with Castle's sentiment, saying, "Of all the deviations from the standard Pokémon formula, the one I appreciate the most is that Cassette Beasts isn't forced to cater to younger children.

[2] The Gamer's Ben Sledge said that he "liked the designs" of the monsters, but did not feel as positively about the fusions, the majority of which were procedurally generated.