Games like The Theodore Adventures
Games like The Theodore Adventures include Hollow Knight, Pikuniku, Shovel Knight: Treasure Trove, Celeste, and Hollow Knight: Silksong. We matched them by the tags players give The Theodore Adventures on Steam (Adventure, Indie, Casual, Platformer, and Retro): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Indie · Difficult

Pikuniku
Shared: Adventure · Indie · Casual

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · Retro

Celeste
Shared: Indie · Difficult · Platformer

Hollow Knight: Silksong
Shared: Indie · Difficult · Platformer

Angry Video Game Nerd Adventures
Shared: Indie · Platformer · Adventure

Minimalism
Shared: Indie · Casual · Adventure

Jump King
Shared: Indie · Adventure · Difficult

Gato Roboto
Shared: Indie · Adventure · Platformer

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Adventure · Casual · Platformer

Super Meat Boy
Shared: Indie · Platformer · Difficult

DuckTales: Remastered
Shared: Adventure · Platformer · Casual

Shio
Shared: Indie · Casual · Difficult

UFO 50
Shared: Indie · Retro · Adventure

BEEP
Shared: Indie · Adventure · Platformer

Chained Together
Shared: Adventure · Casual · Platformer

Out There Somewhere
Shared: Indie · Platformer · Adventure

Toki Tori
Shared: Indie · Casual · Platformer

Volgarr the Viking
Shared: Platformer · Indie · Difficult

Cuphead
Shared: Difficult · Platformer · Indie

Rain World
Shared: Indie · Difficult · Platformer

SANABI
Shared: Adventure · Indie · Action

Getting Over It with Bennett Foddy
Shared: Difficult · Indie · Platformer

Sonic Origins
Shared: Adventure · Retro · Platformer