Games like I Wanna Maker
Games like I Wanna Maker include Geometry Dash, Celeste, Super Meat Boy, Brawlhalla, and Himno. We matched them by the tags players give I Wanna Maker on Steam (Precision Platformer, Free to Play, 2D Platformer, Character Customization, and Multiplayer): closest matches first, and among equally close ones the better-known games.

Geometry Dash
Shared: Level Editor · Precision Platformer · Difficult

Celeste
Shared: Precision Platformer · 2D Platformer · Pixel Graphics

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

Brawlhalla
Shared: Free to Play · Multiplayer · 2D Platformer

Himno
Shared: Free to Play · Pixel Graphics · Singleplayer

Where Winds Meet
Shared: Free to Play · Multiplayer · Singleplayer

Banana
Shared: Free to Play · Singleplayer · 2D

Downwell
Shared: Precision Platformer · 2D Platformer · Pixel Graphics

A Dance of Fire and Ice
Shared: Level Editor · Singleplayer · Difficult

VVVVVV
Shared: Precision Platformer · 2D Platformer · Pixel Graphics

SANABI
Shared: 2D Platformer · Pixel Graphics · Singleplayer

Dota 2
Shared: Free to Play · Multiplayer · Difficult

Jump King
Shared: Precision Platformer · Pixel Graphics · Difficult

MapleStory
Shared: Free to Play · 2D Platformer · Character Customization

Neon Beats
Shared: Free to Play · Precision Platformer · Singleplayer

Bongo Cat
Shared: Free to Play · Character Customization · Singleplayer

skate.
Shared: Free to Play · Multiplayer · Character Customization

Super Bernie World
Shared: Free to Play · 2D Platformer · Pixel Graphics

Bloody Trapland
Shared: Precision Platformer · Multiplayer · Singleplayer

Pixel Gun 3D: PC Edition
Shared: Multiplayer · Pixel Graphics · Character Customization

Pizza Tower
Shared: 2D Platformer · Singleplayer · Pixel Graphics

Transformice
Shared: Free to Play · Multiplayer · 2D

Halo Infinite
Shared: Free to Play · Multiplayer · Singleplayer

Path of Exile
Shared: Free to Play · Multiplayer · Character Customization