Games like BouleMan
Games like BouleMan include BEEP, Webbed, SANABI, Exit the Gungeon, and SONIC X SHADOW GENERATIONS. We matched them by the tags players give BouleMan on Steam (Bullet Hell, Physics, Shooter, 2D Platformer, and 2D): closest matches first, and among equally close ones the better-known games.

BEEP
Shared: Physics · 2D · Singleplayer

Webbed
Shared: 2D Platformer · Physics · 2D

SANABI
Shared: 2D Platformer · Action · Singleplayer

Exit the Gungeon
Shared: Bullet Hell · Action · 2D

SONIC X SHADOW GENERATIONS
Shared: Action · Singleplayer · 2D Platformer

BONEWORKS
Shared: Physics · Shooter · Action

Totally Accurate Battle Simulator
Shared: Physics · Singleplayer · Strategy

Half-Life 2
Shared: Action · Shooter · Singleplayer

Trine Enchanted Edition
Shared: 2D Platformer · Physics · Colorful

Hollow Knight
Shared: 2D · Platformer · Singleplayer

Sonic the Hedgehog 4 Episode 1
Shared: 2D · Action · Singleplayer

Just Cause™ 3
Shared: Action · Shooter · Singleplayer

Geometry Dash
Shared: 2D · Singleplayer · Platformer

Celeste
Shared: 2D Platformer · Singleplayer · 2D

Zombotron
Shared: 2D · Action · Shooter

Sonic Superstars
Shared: 2D Platformer · Action · 2D

Hidden Deep
Shared: Physics · Shooter · 2D Platformer

ShellShock Live
Shared: 2D · Shooter · Strategy

Intrusion 2
Shared: Physics · Action · 2D

Bit Blaster XL
Shared: Bullet Hell · Shooter · 2D

Pizza Tower
Shared: 2D Platformer · Singleplayer · Platformer

Bloons TD 6
Shared: Singleplayer · Strategy · Family Friendly

Trine 5: A Clockwork Conspiracy
Shared: Action · 2D Platformer · Adventure

Just Cause 4 Reloaded
Shared: Action · Singleplayer · Shooter

