Games like Ultra Mega Planet Battles
Games like Ultra Mega Planet Battles include HELLDIVERS™ Dive Harder Edition, Halo: Spartan Assault, Cyberhunt, Escape From Duckov, and Bit Blaster XL. We matched them by the tags players give Ultra Mega Planet Battles on Steam (Twin Stick Shooter, Action, 4 Player Local, Top-Down Shooter, and Adventure): closest matches first, and among equally close ones the better-known games.

HELLDIVERS™ Dive Harder Edition
Shared: Twin Stick Shooter · Top-Down Shooter · Action

Halo: Spartan Assault
Shared: Action · Top-Down Shooter · Twin Stick Shooter

Cyberhunt
Shared: Action · Twin Stick Shooter · Adventure

Escape From Duckov
Shared: Action · Adventure · Top-Down Shooter

Bit Blaster XL
Shared: Action · Shoot 'Em Up · Arcade

Relic Hunters Zero: Remix
Shared: Twin Stick Shooter · Action · Top-Down Shooter

The Ascent
Shared: Top-Down Shooter · Action · Twin Stick Shooter

BALL x PIT
Shared: Action · Arcade · Top-Down Shooter

Shadowgrounds
Shared: Top-Down Shooter · Action · Shooter

Nex Machina
Shared: Twin Stick Shooter · Action · Arcade

Rayman® Legends
Shared: Action · Adventure · 4 Player Local

Sky Force Reloaded
Shared: Top-Down Shooter · Action · Arcade

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Action · Twin Stick Shooter

Halo: Spartan Strike
Shared: Action · Top-Down Shooter · Twin Stick Shooter

Assault Android Cactus+
Shared: Twin Stick Shooter · Shoot 'Em Up · Shooter

Chippy
Shared: Twin Stick Shooter · Top-Down Shooter · Shoot 'Em Up

12 is Better Than 6
Shared: Action · Top-Down Shooter · Shooter

From Space
Shared: Action · Twin Stick Shooter · Top-Down Shooter

Zombotron
Shared: Action · Adventure · 2D

Beat Hazard
Shared: Twin Stick Shooter · Action · Shoot 'Em Up

Splatter - Zombiecalypse Now
Shared: Action · Top-Down Shooter · Twin Stick Shooter

Brigador: Up-Armored Edition
Shared: Twin Stick Shooter · Action · Top-Down Shooter

Guns, Gore and Cannoli 2
Shared: Action · Adventure · 2D

PARTICLE MACE
Shared: Action · Adventure · Arcade