Games like Stick Out!
Games like Stick Out! include SANABI, Celeste, Rogue Legacy 2, Broforce, and I wanna be the Creator. We matched them by the tags players give Stick Out! on Steam (Adventure, Action, Platformer, Action-Adventure, and Arcade): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Action · Adventure · 2D Platformer

Celeste
Shared: Platformer · Precision Platformer · 2D Platformer

Rogue Legacy 2
Shared: Platformer · Action · Arcade

Broforce
Shared: Action · Platformer · 2D

I wanna be the Creator
Shared: Action · Platformer · Adventure

Downwell
Shared: Platformer · Precision Platformer · Action

Shovel Knight: Treasure Trove
Shared: Platformer · Adventure · Action

Super Meat Boy
Shared: Platformer · Precision Platformer · 2D Platformer

Super Mombo Quest
Shared: Adventure · Action · Arcade

Skul: The Hero Slayer
Shared: Action · Platformer · 2D

Ori and the Will of the Wisps
Shared: Platformer · Action · Adventure

Pizza Tower
Shared: 2D Platformer · Platformer · Action

Sonic Origins
Shared: Action · Adventure · Platformer

BlazBlue Entropy Effect
Shared: Action · Action-Adventure · Platformer

Sonic Mania
Shared: Platformer · Adventure · 2D

Anomaly Agent
Shared: Platformer · Side Scroller · 2D Platformer

Super Bernie World
Shared: Action · Adventure · Platformer

Prince of Persia The Lost Crown
Shared: Action · Adventure · 2D Platformer

Jump King
Shared: Adventure · Platformer · Precision Platformer

VVVVVV
Shared: Platformer · Precision Platformer · 2D Platformer

Sonic Superstars
Shared: Action · Platformer · Adventure

The Messenger
Shared: Platformer · Action · 2D

Smilemo
Shared: Adventure · Action · Platformer

Monster Boy and the Cursed Kingdom
Shared: Adventure · Action · Platformer