Games like Underkeep
Games like Underkeep include Kingdom Rush - Tower Defense, FTL: Faster Than Light, Plague Inc: Evolved, Plants vs. Zombies GOTY Edition, and Door Kickers. We matched them by the tags players give Underkeep on Steam (Simulation, Strategy, Roguelike, Tower Defense, and 2D Platformer): closest matches first, and among equally close ones the better-known games.
Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · 2D
FTL: Faster Than Light
Shared: Roguelike · Strategy · Simulation
Plague Inc: Evolved
Shared: Simulation · Strategy · Indie
Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · 2D
Door Kickers
Shared: Strategy · Simulation · Top-Down
Game Dev Tycoon
Shared: Simulation · Strategy · 2D
GemCraft - Chasing Shadows
Shared: Strategy · Tower Defense · Top-Down
911 Operator
Shared: Simulation · Strategy · Indie
Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · 2D
Prison Architect
Shared: Simulation · Strategy · 2D
Bloons TD 6
Shared: Strategy · Tower Defense · Casual
The King is Watching
Shared: Roguelike · Tower Defense · Strategy
Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Tower Defense · 2D
Creeper World 3: Arc Eternal
Shared: Strategy · Tower Defense · Simulation
Rogue Tower
Shared: Strategy · Tower Defense · Roguelike
Mini Motorways
Shared: Simulation · Strategy · Casual
Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · 2D
Necrosmith
Shared: Tower Defense · Strategy · Roguelike
Rise to Ruins
Shared: Tower Defense · Strategy · Simulation
Sir, We Have an Orc Problem
Shared: Tower Defense · Strategy · Roguelike
Balatro
Shared: Roguelike · Strategy · Indie
Dungeon Warfare
Shared: Strategy · Tower Defense · 2D
Reus
Shared: Strategy · Simulation · 2D
Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Indie