Games like They Came From Below
Games like They Came From Below include Thronefall, Plants vs. Zombies GOTY Edition, Slime Rancher, Bee Island, and Totally Accurate Battle Simulator. We matched them by the tags players give They Came From Below on Steam (Simulation, Tower Defense, Adventure, Cute, and Strategy): closest matches first, and among equally close ones the better-known games.

Thronefall
Shared: Tower Defense · Strategy · Action RTS

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

Slime Rancher
Shared: Cute · Adventure · Simulation

Bee Island
Shared: Tower Defense · Strategy · Action RTS

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Adventure

Ultimate Epic Battle Simulator 2
Shared: Simulation · Strategy · Adventure

Mini Motorways
Shared: Simulation · Strategy · Puzzle

Bloons TD 6
Shared: Tower Defense · Strategy · Casual

Slime Rancher 2
Shared: Cute · Simulation · Adventure

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Base Building

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

Hello Kitty Island Adventure
Shared: Adventure · Simulation · Cute

Pikuniku
Shared: Adventure · Cute · Puzzle

Manor Lords
Shared: Simulation · Strategy · Base Building

Diplomacy is Not an Option
Shared: Tower Defense · Base Building · Action RTS

Stronghold: Definitive Edition
Shared: Strategy · Real Time Tactics · Tower Defense

Planet Coaster
Shared: Simulation · Strategy · Adventure

Dorfromantik
Shared: Puzzle · Strategy · Simulation

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

Rise to Ruins
Shared: Tower Defense · Strategy · Simulation

Gold Gold Adventure Gold
Shared: Simulation · Strategy · Tower Defense

Stronghold Crusader: Definitive Edition
Shared: Strategy · Real Time Tactics · Tower Defense

MINOS
Shared: Tower Defense · Strategy · Simulation

They Are Billions
Shared: Strategy · Tower Defense · Base Building