Games like PROJECT.98
Games like PROJECT.98 include Vampire Survivors, Megabonk, Enter the Gungeon, Skul: The Hero Slayer, and Desktop Survivors 98. We matched them by the tags players give PROJECT.98 on Steam (Action, Action Roguelike, Casual, 1990's, and Retro): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Pixel Graphics
Megabonk
Shared: Action Roguelike · Roguelike · Action
Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Roguelike
Skul: The Hero Slayer
Shared: Action · Action Roguelike · Roguelike
Desktop Survivors 98
Shared: Action Roguelike · Action · Casual
Death Must Die
Shared: Action Roguelike · Bullet Hell · Action
The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Pixel Graphics
Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Pixel Graphics
Halls of Torment
Shared: Action Roguelike · Bullet Hell · Action
Nuclear Throne
Shared: Action Roguelike · Action · Roguelike
Noobs Want to Live
Shared: Action · Bullet Hell · Action Roguelike
Seraph's Last Stand
Shared: Action Roguelike · Casual · Bullet Hell
BALL x PIT
Shared: Action · Action Roguelike · Bullet Hell
Dead Cells
Shared: Action Roguelike · Roguelike · 2D
Dungreed
Shared: Action Roguelike · Action · Roguelike
Rocket Rats
Shared: Action Roguelike · Casual · Bullet Hell
Realm of the Mad God Exalt
Shared: Action Roguelike · Bullet Hell · Roguelike
Risk of Rain (2013)
Shared: Action Roguelike · Action · Roguelike
Rogue Legacy
Shared: Action Roguelike · Action · Roguelike
Brotato
Shared: Action Roguelike · Roguelike · Bullet Hell
Hades
Shared: Action Roguelike · Action · Roguelike
Planes, Bullets and Vodka
Shared: Action · Casual · Retro
Asgard's Fall — Viking Survivors
Shared: Action Roguelike · Casual · Bullet Hell
The Binding of Isaac
Shared: Action Roguelike · Roguelike · Action