Games like Operation: Outbreak Idle
Games like Operation: Outbreak Idle include Plants vs. Zombies GOTY Edition, Bloons TD 6, 20 Minutes Till Dawn, Megabonk, and Yet Another Zombie Survivors. We matched them by the tags players give Operation: Outbreak Idle on Steam (Tower Defense, Zombies, Bullet Heaven, Bullet Hell, and Strategy): closest matches first, and among equally close ones the better-known games.
Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Zombies · Strategy
Bloons TD 6
Shared: Tower Defense · Strategy · Singleplayer
20 Minutes Till Dawn
Shared: Bullet Hell · Survival · Shoot 'Em Up
Megabonk
Shared: Bullet Heaven · Bullet Hell · Survival
Yet Another Zombie Survivors
Shared: Zombies · Bullet Heaven · Singleplayer
Necrosmith
Shared: Zombies · Tower Defense · Bullet Hell
They Are Billions
Shared: Zombies · Strategy · Tower Defense
Brotato
Shared: Bullet Hell · Singleplayer · Bullet Heaven
Plague Inc: Evolved
Shared: Strategy · Zombies · Singleplayer
Apocalypse Party
Shared: Singleplayer · Casual · Bullet Hell
Kingdom Rush - Tower Defense
Shared: Tower Defense · Strategy · Singleplayer
Plants vs. Zombies™: Replanted
Shared: Tower Defense · Zombies · Casual
Heretic's Fork
Shared: Tower Defense · Bullet Heaven · Strategy
Plants vs. Zombies: Battle for Neighborville™
Shared: Zombies · Tower Defense · Casual
Bloons TD 5
Shared: Tower Defense · Strategy · Casual
Rogue Tower
Shared: Tower Defense · Strategy · Casual
Kingdom Rush Frontiers - Tower Defense
Shared: Tower Defense · Strategy · Singleplayer
Astro Prospector
Shared: Bullet Hell · Bullet Heaven · Casual
Kingdom Rush Origins - Tower Defense
Shared: Tower Defense · Strategy · Singleplayer
Dungeon Defenders
Shared: Tower Defense · Strategy · Singleplayer
Night of the Dead
Shared: Zombies · Tower Defense · Singleplayer
Outhold
Shared: Tower Defense · Strategy · Incremental
Dead Age
Shared: Zombies · Strategy · Survival
Left 4 Dead 2
Shared: Zombies · Survival · Shooter