Games like Abyss Defence
Games like Abyss Defence include The King is Watching, Creeper World 3: Arc Eternal, Age of Darkness: Final Stand, Lessaria: Fantasy Kingdom Sim, and The Escapists. We matched them by the tags players give Abyss Defence on Steam (Simulation, Strategy, RTS, Roguelike, and Strategy RPG): closest matches first, and among equally close ones the better-known games.

The King is Watching
Shared: Roguelike · RTS · Tower Defense

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

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

Lessaria: Fantasy Kingdom Sim
Shared: Strategy · RTS · Simulation

The Escapists
Shared: Strategy · Simulation · Pixel Graphics

Crusader Kings III
Shared: Strategy · Simulation · Medieval

Dungeon of the ENDLESS™
Shared: Strategy · Roguelike · Tower Defense

FTL: Faster Than Light
Shared: Strategy · Roguelike · Simulation

Loop Hero
Shared: Roguelike · Pixel Graphics · Strategy RPG

Rise to Ruins
Shared: Strategy · Tower Defense · Simulation

Stoneshard
Shared: Strategy · Roguelike · Pixel Graphics

Balatro
Shared: Roguelike · Strategy · Pixel Graphics

Total War: WARHAMMER
Shared: Strategy · Simulation · RTS

Dome Keeper
Shared: Roguelike · Tower Defense · Simulation

Age of Empires II (Retired)
Shared: Strategy · RTS · Medieval

Particle Fleet: Emergence
Shared: Strategy · Simulation · RTS

Necrosmith
Shared: Strategy · Tower Defense · Roguelike

Diplomacy is Not an Option
Shared: RTS · Medieval · Strategy

Mindustry
Shared: RTS · Strategy · Tower Defense

Plague Inc: Evolved
Shared: Simulation · Strategy · Indie

Papers, Please
Shared: Simulation · Pixel Graphics · Indie

The Escapists 2
Shared: Strategy · Simulation · Pixel Graphics

Game Dev Tycoon
Shared: Simulation · Strategy · 2D

RIOT: Civil Unrest
Shared: Simulation · Strategy · RTS