Games like UDONGAIN
Games like UDONGAIN include Alex Jones: NWO Wars, Kill The Crows, BALL x PIT, Bit Blaster XL, and Planes, Bullets and Vodka. We matched them by the tags players give UDONGAIN on Steam (2D Platformer, Shoot 'Em Up, Top-Down Shooter, Action, and Shooter): closest matches first, and among equally close ones the better-known games.
Alex Jones: NWO Wars
Shared: 2D Platformer · Action · Shoot 'Em Up
Kill The Crows
Shared: Action · Top-Down Shooter · Arcade
BALL x PIT
Shared: Action · Arcade · Shoot 'Em Up
Bit Blaster XL
Shared: Shoot 'Em Up · Shooter · Arcade
Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Action · Arcade
DoDonPachi Resurrection
Shared: Shoot 'Em Up · Top-Down Shooter · Shooter
Black Market of Bulletphilia ~ 100th Black Market.
Shared: Shoot 'Em Up · Shooter · Female Protagonist
DRAINUS
Shared: Shoot 'Em Up · Action · Shooter
Bot Vice
Shared: Top-Down Shooter · Shoot 'Em Up · Arcade
Cyberhunt
Shared: Action · Shoot 'Em Up · Arcade
Huntdown
Shared: Action · Shooter · Shoot 'Em Up
BLUE REVOLVER
Shared: Shoot 'Em Up · Action · Arcade
Mirage Feathers
Shared: Shoot 'Em Up · Cute · Shooter
LUFTRAUSERS
Shared: Action · Arcade · Shoot 'Em Up
Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Action · Female Protagonist
ZeroRanger
Shared: Shoot 'Em Up · Action · Arcade
Sky Force Reloaded
Shared: Shoot 'Em Up · Top-Down Shooter · Arcade
Muse Dash
Shared: Female Protagonist · Cute · 2D
Celeste
Shared: 2D Platformer · Female Protagonist · 2D
Contra: Operation Galuga
Shared: Action · 2D Platformer · Shooter
SNKRX
Shared: Top-Down Shooter · Shoot 'Em Up · Arcade
Bleed
Shared: Action · Female Protagonist · Shooter
Twin Shot Deluxe
Shared: 2D Platformer · Action · Arcade
METAL SLUG
Shared: Action · Shoot 'Em Up · Arcade