Games like Mutant Monster Invasion
Games like Mutant Monster Invasion include Bloons TD 6, Creeper World 4, Age of Darkness: Final Stand, Plants vs. Zombies GOTY Edition, and Rogue Tower. We matched them by the tags players give Mutant Monster Invasion on Steam (Casual, Strategy, RTS, Tower Defense, and Incremental): closest matches first, and among equally close ones the better-known games.

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

Creeper World 4
Shared: Tower Defense · RTS · Strategy

Age of Darkness: Final Stand
Shared: Tower Defense · RTS · Strategy

Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · Casual

Rogue Tower
Shared: Strategy · Casual · Tower Defense

Age of Mythology: Retold
Shared: Strategy · RTS · 3D

Cookie Clicker
Shared: Casual · Incremental · Indie

Mini Motorways
Shared: Strategy · Casual · Indie

Creeper World 3: Arc Eternal
Shared: Strategy · Tower Defense · RTS

They Are Billions
Shared: Strategy · RTS · Tower Defense

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Tower Defense · Casual

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Casual

Thronefall
Shared: Strategy · Tower Defense · 3D

Mindustry
Shared: Tower Defense · RTS · Strategy

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · Casual

Crustacean Nations
Shared: Casual · Strategy · RTS

Oriental Dynasty - Silk Road defense war
Shared: Strategy · Casual · Tower Defense

Tower Dominion
Shared: Strategy · Tower Defense · RTS

Infested Planet
Shared: Strategy · Tower Defense · RTS

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · Cartoon

Bills Must Be Paid
Shared: Strategy · Incremental · Casual

Startup Company
Shared: Strategy · Casual · Indie

A Game About Feeding A Black Hole
Shared: Casual · Strategy · Incremental

Bee Island
Shared: Strategy · Tower Defense · 3D