Games like Illvelo Swamp
Games like Illvelo Swamp include BALL x PIT, Bit Blaster XL, LUFTRAUSERS, Planes, Bullets and Vodka, and Nova Drift. We matched them by the tags players give Illvelo Swamp on Steam (Action, Shoot 'Em Up, Bullet Hell, Arcade, and 2D): closest matches first, and among equally close ones the better-known games.
BALL x PIT
Shared: Action · Bullet Hell · Arcade
Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Arcade
LUFTRAUSERS
Shared: Bullet Hell · Action · Arcade
Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Bullet Hell
Nova Drift
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Vampire Survivors
Shared: Bullet Hell · 2D · Singleplayer
Geometry Wars: Retro Evolved
Shared: Arcade · Bullet Hell · Shoot 'Em Up
Sky Force Reloaded
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Beat Hazard
Shared: Bullet Hell · Shoot 'Em Up · Twin Stick Shooter
Waves
Shared: Shoot 'Em Up · Bullet Hell · Arcade
DoDonPachi Resurrection
Shared: Shoot 'Em Up · Bullet Hell · Action
Ikaruga
Shared: Shoot 'Em Up · Bullet Hell · Action
Chippy
Shared: Bullet Hell · Shoot 'Em Up · Twin Stick Shooter
Mushihimesama
Shared: Shoot 'Em Up · Bullet Hell · Action
Star Saviors
Shared: Shoot 'Em Up · Action · Bullet Hell
Cyberhunt
Shared: Action · Shoot 'Em Up · Arcade
Revolution Ace
Shared: Action · Shoot 'Em Up · Bullet Hell
Nex Machina
Shared: Action · Bullet Hell · Arcade
DRAINUS
Shared: Action · Shoot 'Em Up · 2D
ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Action
State of Anarchy: Master of Mayhem
Shared: Action · Bullet Hell · Shoot 'Em Up
Touhou Kinjoukyou ～ Fossilized Wonders.
Shared: Shoot 'Em Up · Bullet Hell · Action
Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Bullet Hell · Action
METAL SLUG
Shared: Action · Arcade · 2D