Games like Koi Frenzy
Games like Koi Frenzy include Vampire Survivors, A Dance of Fire and Ice, Timberman, Cat Goes Fishing, and pureya. We matched them by the tags players give Koi Frenzy on Steam (Action, Arcade, Casual, 2D, and Cozy): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: 2D · Casual · Singleplayer

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

Timberman
Shared: Casual · Action · 2D

Cat Goes Fishing
Shared: 2D · Fishing · Casual

pureya
Shared: Arcade · Casual · 2D

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

Super Hexagon
Shared: Arcade · Indie · Action

Zuma's Revenge!
Shared: Action · Casual · Singleplayer

Planes, Bullets and Vodka
Shared: Action · Casual · Arcade

PAC-MAN™ Championship Edition DX+
Shared: Arcade · Action · 2D

One Finger Death Punch
Shared: Action · Indie · Singleplayer

DJMAX RESPECT V
Shared: Casual · Action · 2D

Cyberhunt
Shared: Action · Casual · Arcade

Orbt XL
Shared: Arcade · Action · 2D

MARVEL Tōkon: Fighting Souls
Shared: Action · Casual · Arcade

One Finger Death Punch 2
Shared: Action · Casual · Indie

Geometry Dash
Shared: 2D · Singleplayer · Colorful

Rogue Legacy 2
Shared: Arcade · Action · Indie

Melatonin
Shared: Indie · 2D · Action

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

Shelldiver
Shared: Casual · Arcade · 2D

Sixtar Gate: STARTRAIL
Shared: Action · Casual · Arcade

AudioSurf
Shared: Casual · Arcade · Indie

LUFTRAUSERS
Shared: Arcade · Action · Indie