Games like Timmy's Adventures
Games like Timmy's Adventures include Pizza Tower, Thank Goodness You're Here!, Celeste, SANABI, and Katana ZERO. We matched them by the tags players give Timmy's Adventures on Steam (Time Management, 2D Platformer, Real Time Tactics, Platformer, and Arcade): closest matches first, and among equally close ones the better-known games.

Pizza Tower
Shared: 2D Platformer · Platformer · Funny

Thank Goodness You're Here!
Shared: 2D Platformer · Funny · Platformer

Celeste
Shared: 2D Platformer · Platformer · 2D

SANABI
Shared: 2D Platformer · 2D · Story Rich

Katana ZERO
Shared: Platformer · 2D Platformer · Story Rich

Hollow Knight
Shared: Platformer · 2D · Indie

BattleBlock Theater®
Shared: Platformer · Funny · 2D

The Elephant Collection
Shared: 2D Platformer · Arcade · Platformer

Sonic Origins
Shared: 2D Platformer · Platformer · Action

Webbed
Shared: 2D Platformer · Cute · Platformer

Portal 2
Shared: Platformer · Dark Humor · Funny

Pikuniku
Shared: Cute · Platformer · 2D

Twin Shot Deluxe
Shared: 2D Platformer · Arcade · Platformer

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

Rogue Legacy 2
Shared: Arcade · Platformer · 2D

Songs for a Hero - Definitive Edition
Shared: 2D Platformer · Platformer · Funny

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: Arcade · 2D · Funny

Downwell
Shared: Platformer · 2D Platformer · Arcade

Pepper Grinder
Shared: 2D Platformer · Platformer · Arcade

Broforce
Shared: Platformer · 2D · Action

SUPER CHICKEN JUMPER
Shared: Arcade · 2D · Cute

The Messenger
Shared: Platformer · 2D · 2D Platformer

Grapple Dog
Shared: 2D Platformer · Platformer · 2D

pureya
Shared: Arcade · 2D · Platformer