Games like My Pet Rock
Games like My Pet Rock include Orcs Must Die! 2, Orcs Must Die!, X-Morph: Defense, GemCraft - Chasing Shadows, and Sanctum 2. We matched them by the tags players give My Pet Rock on Steam (Action, Indie, and Tower Defense): closest matches first, and among equally close ones the better-known games.

Orcs Must Die! 2
Shared: Action · Tower Defense · Indie

Orcs Must Die!
Shared: Action · Tower Defense · Indie

X-Morph: Defense
Shared: Action · Tower Defense · Indie

GemCraft - Chasing Shadows
Shared: Tower Defense · Indie · Action

Sanctum 2
Shared: Tower Defense · Action · Indie

Skul: The Hero Slayer
Shared: Action · Indie

Hotline Miami
Shared: Action · Indie

Rock 'N' Roll Defense
Shared: Tower Defense · Action · Indie

Rock of Ages
Shared: Indie · Action · Tower Defense

Infested Planet
Shared: Action · Tower Defense · Indie

Hades
Shared: Indie · Action

Taur
Shared: Action · Tower Defense · Indie

Deathtrap
Shared: Action · Tower Defense · Indie

My Friend Pedro
Shared: Action · Indie

Let Them Come
Shared: Action · Indie · Tower Defense

Orcs Must Die! 3
Shared: Tower Defense · Action · Indie

CastleStorm
Shared: Indie · Action · Tower Defense

KovaaK's
Shared: Action · Indie

Bright Memory: Infinite
Shared: Action · Indie

Sanctum
Shared: Tower Defense · Action · Indie

Sang-Froid - Tales of Werewolves
Shared: Action · Tower Defense · Indie

Rock of Ages 2: Bigger & Boulder™
Shared: Action · Indie · Tower Defense

Thronefall
Shared: Tower Defense · Action · Indie

SUPERHOT
Shared: Action · Indie