Games like PLANETOIDS
Games like PLANETOIDS include Project Wingman, ACE COMBAT™ 7: SKIES UNKNOWN, LUFTRAUSERS, Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad, and The Escapists. We matched them by the tags players give PLANETOIDS on Steam (Arcade, Simulation, Score Attack, Action, and Flight): closest matches first, and among equally close ones the better-known games.

Project Wingman
Shared: Action · Flight · Arcade

ACE COMBAT™ 7: SKIES UNKNOWN
Shared: Arcade · Flight · Action

LUFTRAUSERS
Shared: Arcade · Action · Pixel Graphics

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

The Escapists
Shared: Pixel Graphics · Simulation · Action

Vampire Survivors
Shared: Pixel Graphics · Arcade · Action

War Thunder
Shared: Simulation · Action · Flight

Aimlabs
Shared: Simulation · Action · Score Attack

Broforce
Shared: Action · Pixel Graphics · 2D

Timberman
Shared: Pixel Graphics · Action · Arcade

Warhammer 40,000: Boltgun
Shared: Action · Pixel Graphics · Arcade

PAC-MAN™ Championship Edition DX+
Shared: Arcade · Action · Score Attack

Bit Blaster XL
Shared: Arcade · Action · Shooter

KovaaK's
Shared: Simulation · Action · Shooter

Exit the Gungeon
Shared: Arcade · Action · Pixel Graphics

BALL x PIT
Shared: Arcade · Action · Pixel Graphics

Planes, Bullets and Vodka
Shared: Action · Arcade · Pixel Graphics

Nuclear Option
Shared: Simulation · Flight · Action

FPV Kamikaze Drone
Shared: Simulation · Action · Flight

ZERO Sievert
Shared: Pixel Graphics · Survival · Action

Megabonk
Shared: Action · Arcade · Pixel Graphics

Kill The Crows
Shared: Arcade · Action · Pixel Graphics

Jet Lancer
Shared: Action · Flight · Pixel Graphics

Terraria
Shared: Pixel Graphics · Survival · 2D