Games like Stimuli
Games like Stimuli include Skul: The Hero Slayer, Rogue Legacy 2, Rogue Legacy, Vampire Survivors, and Defy Gravity Extended. We matched them by the tags players give Stimuli on Steam (Action, Casual, Indie, Platformer, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Skul: The Hero Slayer
Shared: Action · Indie · Platformer

Rogue Legacy 2
Shared: Action · Platformer · Indie

Rogue Legacy
Shared: Platformer · Indie · Action

Vampire Survivors
Shared: Indie · Casual · Roguelite

Defy Gravity Extended
Shared: Indie · Platformer · Puzzle Platformer

Broforce
Shared: Action · Platformer · Indie

Katana ZERO
Shared: Action · Platformer · Indie

Dead Cells
Shared: Metroidvania · Roguelike · Platformer

Hollow Knight
Shared: Platformer · Metroidvania · Indie

Axiom Verge
Shared: Indie · Action · Metroidvania

Downwell
Shared: Indie · Platformer · Action

Planet of Lana
Shared: Action · Puzzle Platformer · 2D Platformer

Risk of Rain (2013)
Shared: Indie · Action · Platformer

Gensokyo Night Festival
Shared: Action · Indie · Casual

Megabonk
Shared: Indie · Action · Roguelike

Nine Sols
Shared: Action · Metroidvania · Platformer

The Messenger
Shared: Platformer · Metroidvania · Action

Dust: An Elysian Tail
Shared: Action · Platformer · Indie

Brawlhalla
Shared: Casual · 2D Platformer · Platformer

Celeste
Shared: Indie · Platformer · 2D Platformer

Öoo
Shared: 2D Platformer · Metroidvania · Puzzle Platformer

Hollow Knight: Silksong
Shared: Indie · Metroidvania · Platformer

Pizza Tower
Shared: Indie · 2D Platformer · Platformer

ScourgeBringer
Shared: Action · Indie · Platformer