Gash is a fish-eating simulator that allows the player to take control of a sea monster and devour other creatures. Each character plays differently through 4 different zones across 7 levels of chaotic gameplay against an array of enemies that can defeated through combat. All the visuals in the game have been made with clay to create a violent, cartoon-ish atmosphere set in an undersea environment.

The game features:
- Characters made entirely of clay sculpting
- 3 characters who each play differently
- 4 different environments
- 7 levels
- 10 different fish to eat and chunk into giblets
- 2 bosses
- 4 weapons to use in chaotic flurries of fish and boss fights
- Some options to tweak the game's operation