Games like Mutant Fish
Games like Mutant Fish include Geometry Dash, Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad, Vampire Survivors, Gorogoa, and Feeding Frenzy 2 Deluxe. We matched them by the tags players give Mutant Fish on Steam (Hand-drawn, Character Customization, 2D, Casual, and Arcade): closest matches first, and among equally close ones the better-known games.

Geometry Dash
Shared: 2D · Character Customization · Indie

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: 2D · Arcade · Casual

Vampire Survivors
Shared: 2D · Casual · Indie

Gorogoa
Shared: Hand-drawn · Casual · Indie

Feeding Frenzy 2 Deluxe
Shared: Casual · Arcade · 2D

Hidden Folks
Shared: Hand-drawn · Casual · 2D

Cat Goes Fishing
Shared: 2D · Casual · Indie

A Dance of Fire and Ice
Shared: 2D · Arcade · Indie

Thank Goodness You're Here!
Shared: Hand-drawn · Casual · 2D

Melatonin
Shared: Hand-drawn · 2D · Indie

Timberman
Shared: Casual · 2D · Indie

Streets of Rage 4
Shared: 2D · Arcade · Indie

The Bridge
Shared: Hand-drawn · 2D · Surreal

pureya
Shared: 2D · Casual · Arcade

Nubby's Number Factory
Shared: Arcade · Surreal · 2D

GRIS
Shared: Hand-drawn · Indie · 2D

To The Core
Shared: 2D · Casual · Arcade

Peggle Deluxe
Shared: Casual · Arcade · 2D

Machinarium
Shared: Hand-drawn · 2D · Casual

Hollow Knight
Shared: 2D · Indie · Hand-drawn

100 hidden snails
Shared: 2D · Casual · Hand-drawn

Ding Dong XL
Shared: Character Customization · 2D · Arcade

Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: 2D · Side Scroller · Arcade

LIMBO
Shared: 2D · Indie · Surreal