Games like I'm Not Sleepy
Games like I'm Not Sleepy include Vampire Survivors, Enter the Gungeon, Skul: The Hero Slayer, Megabonk, and The Binding of Isaac. We matched them by the tags players give I'm Not Sleepy on Steam (Action, Action Roguelike, Bullet Hell, Roguelike, and 2D): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Action Roguelike · Bullet Hell · 2D
Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Roguelike
Skul: The Hero Slayer
Shared: Action · Action Roguelike · Roguelike
Megabonk
Shared: Action Roguelike · Roguelike · Bullet Hell
The Binding of Isaac
Shared: Action Roguelike · Roguelike · Action
BALL x PIT
Shared: Action · Bullet Hell · Action Roguelike
Hades
Shared: Action Roguelike · Action · Roguelike
Halls of Torment
Shared: Action Roguelike · Bullet Hell · Action
Nuclear Throne
Shared: Action Roguelike · Roguelike · Action
The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Indie
Rogue Legacy
Shared: Action Roguelike · Roguelike · Action
Brotato
Shared: Roguelike · Bullet Hell · Action Roguelike
Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Bullet Hell · Action
Death Must Die
Shared: Action Roguelike · Bullet Hell · Action
Hades II
Shared: Action · Roguelike · Action Roguelike
Dungreed
Shared: Action Roguelike · Action · Roguelike
Rabbit and Steel
Shared: Action Roguelike · Bullet Hell · Roguelike
Risk of Rain (2013)
Shared: Action Roguelike · Roguelike · Action
Hero Siege
Shared: Action Roguelike · Roguelike · Action
Noobs Want to Live
Shared: Bullet Hell · Action · Roguelike
Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelike
I Am Legion: Stand Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike
Star of Providence
Shared: Action Roguelike · Bullet Hell · Action
Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike