Games like Matheroïde
Games like Matheroïde include Vampire Survivors, Timberman, Skul: The Hero Slayer, A Dance of Fire and Ice, and pureya. We matched them by the tags players give Matheroïde on Steam (Singleplayer, Action, Casual, Space, and Futuristic): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Singleplayer · Roguelite · 2D

Timberman
Shared: Casual · Action · Singleplayer

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

A Dance of Fire and Ice
Shared: Singleplayer · 2D · Arcade

pureya
Shared: Casual · Singleplayer · Arcade

Megabonk
Shared: Action · Roguelite · Singleplayer

Rogue Legacy 2
Shared: Action · Arcade · Singleplayer

Cyberhunt
Shared: Action · Casual · Indie

Sixtar Gate: STARTRAIL
Shared: Action · Casual · 2D

Planes, Bullets and Vodka
Shared: Action · Casual · Singleplayer

Boneraiser Minions
Shared: Singleplayer · 2D · Roguelite

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

Defy Gravity Extended
Shared: Singleplayer · Space · Action

DJMAX RESPECT V
Shared: Casual · Action · Singleplayer

Zuma's Revenge!
Shared: Action · Singleplayer · Casual

Rocket Rats
Shared: Casual · Singleplayer · Action

BALL x PIT
Shared: Action · Arcade · Roguelite

To The Core
Shared: Casual · 2D · Singleplayer

Rogue Legacy
Shared: Action · Singleplayer · 2D

Rhythm Doctor
Shared: Singleplayer · Action · 2D

Super Hexagon
Shared: Singleplayer · Arcade · Action

Orbt XL
Shared: Action · Arcade · 2D

Trailmakers
Shared: Action · Space · Singleplayer

Kingdom Rush - Tower Defense
Shared: Singleplayer · 2D · Casual