Games like Maze Mayhem
Games like Maze Mayhem include Undertale, Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad, Timberman, Human Fall Flat, and Kindergarten. We matched them by the tags players give Maze Mayhem on Steam (Choices Matter, Arcade, Action, Puzzle, and Minimalist): closest matches first, and among equally close ones the better-known games.

Undertale
Shared: Choices Matter · Pixel Graphics · Funny

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

Timberman
Shared: Action · Pixel Graphics · Arcade

Human Fall Flat
Shared: Puzzle · Funny · Action

Kindergarten
Shared: Funny · Pixel Graphics · Choices Matter

Fever Meme
Shared: Choices Matter · Action · Funny

Trip to Vinelands
Shared: Arcade · Action · Pixel Graphics

Broforce
Shared: Action · Pixel Graphics · 2D

Turnip Boy Commits Tax Evasion
Shared: Puzzle · Funny · Action

There Is No Game: Wrong Dimension
Shared: Puzzle · Pixel Graphics · Funny

UFO 50
Shared: Action · Arcade · Pixel Graphics

Vampire Survivors
Shared: Pixel Graphics · Arcade · Action

Zup!
Shared: Puzzle · Minimalist · Casual

Portal 2
Shared: Puzzle · Funny · Action

BALL x PIT
Shared: Action · Arcade · Pixel Graphics

Downwell
Shared: Arcade · Pixel Graphics · Action

I hate this game
Shared: Puzzle · Pixel Graphics · Minimalist

OneShot
Shared: Pixel Graphics · Choices Matter · Puzzle

Kindergarten 2
Shared: Pixel Graphics · Puzzle · Funny

Baba Is You
Shared: Puzzle · Pixel Graphics · Indie

SUPER CHICKEN JUMPER
Shared: Arcade · Pixel Graphics · Action

Portal
Shared: Puzzle · Puzzle Platformer · Action

Gunpoint
Shared: Puzzle · Pixel Graphics · Action

TTV2
Shared: Action · Arcade · Pixel Graphics