Games like KOTARO Survivor
Games like KOTARO Survivor include Vampire Survivors, Brotato, Megabonk, Hades, and The Binding of Isaac: Rebirth. We matched them by the tags players give KOTARO Survivor on Steam (Singleplayer, Action Roguelike, Roguelike, Survival, and Casual): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Singleplayer · Bullet Hell

Brotato
Shared: Singleplayer · Roguelike · Action Roguelike

Megabonk
Shared: Action Roguelike · Roguelike · Survival

Hades
Shared: Action Roguelike · Singleplayer · Roguelike

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Singleplayer

Enter the Gungeon
Shared: Action Roguelike · Roguelike · Bullet Hell

Skul: The Hero Slayer
Shared: Action Roguelike · Roguelike · Singleplayer

Risk of Rain 2
Shared: Action Roguelike · Roguelike · Roguelite

20 Minutes Till Dawn
Shared: Action Roguelike · Survival · Bullet Hell

Death Must Die
Shared: Action Roguelike · Bullet Hell · Roguelike

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Singleplayer

Nuclear Throne
Shared: Action Roguelike · Roguelike · Bullet Hell

FatalZone
Shared: Action Roguelike · Survival · Bullet Hell

Halls of Torment
Shared: Action Roguelike · Roguelike · Bullet Hell

Rocket Rats
Shared: Action Roguelike · Singleplayer · Casual

Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Roguelike · Singleplayer

Soulstone Survivors
Shared: Action Roguelike · Roguelike · Bullet Hell

Yet Another Zombie Survivors
Shared: Action Roguelike · Singleplayer · Roguelike

Apocalypse Party
Shared: Singleplayer · Action Roguelike · Casual

Rogue Legacy
Shared: Roguelike · Action Roguelike · Singleplayer

BALL x PIT
Shared: Roguelike · Action Roguelike · Roguelite

Dead Cells
Shared: Roguelike · Action Roguelike · Singleplayer

Nova Drift
Shared: Action Roguelike · Bullet Hell · Roguelike

Boneraiser Minions
Shared: Action Roguelike · Singleplayer · Bullet Hell