Games like Planet R-12
Games like Planet R-12 include ICEY, Skul: The Hero Slayer, Caster, Eastern Exorcist, and Dungeon Munchies. We matched them by the tags players give Planet R-12 on Steam (Indie, Action, Adventure, Strategy, and Side Scroller): closest matches first, and among equally close ones the better-known games.

ICEY
Shared: Action · Indie · Adventure

Skul: The Hero Slayer
Shared: Indie · Action · Side Scroller

Caster
Shared: Indie · Action · Adventure

Eastern Exorcist
Shared: Action · Adventure · Side Scroller

Dungeon Munchies
Shared: Indie · Action · Adventure

RADical ROACH Remastered
Shared: Indie · Action · Adventure

Deadlight
Shared: Action · Indie · Adventure

Mount & Blade II: Bannerlord
Shared: Strategy · Action · Indie

Orcs Must Die! 2
Shared: Action · Indie · Strategy

UFO 50
Shared: Indie · Action · Strategy

Notes of Soul
Shared: Action · Adventure · Indie

Bladed fury
Shared: Indie · Action · Adventure

SANABI
Shared: Action · Adventure · Indie

Mark of the Ninja
Shared: Indie · Action · Adventure

Dust: An Elysian Tail
Shared: Action · Indie · Adventure

Monster Boy and the Cursed Kingdom
Shared: Action · Indie · Adventure

Your Only Move Is HUSTLE
Shared: Action · Strategy · Indie

SteamWorld Heist
Shared: Strategy · Indie · Action

Han Xiongnu Wars
Shared: Action · Strategy · Indie

Rock 'N' Roll Defense
Shared: Action · Strategy · Adventure

The Vagrant
Shared: Action · Adventure · Indie

The Escapists
Shared: Strategy · Indie · Action

Gato Roboto
Shared: Indie · Action · Adventure

Broforce
Shared: Action · Indie · Side Scroller