Games like Abfense
Games like Abfense include Thronefall, SUPERHOT, Sanctum 2, Kingdom Rush 6: Genesis TD, and Freeman: Guerrilla Warfare. We matched them by the tags players give Abfense on Steam (Action, Strategy, Puzzle, Tower Defense, and Beat 'em up): closest matches first, and among equally close ones the better-known games.

Thronefall
Shared: Strategy · Tower Defense · Action

SUPERHOT
Shared: Action · FPS · Puzzle

Sanctum 2
Shared: Tower Defense · Strategy · Action

Kingdom Rush 6: Genesis TD
Shared: Strategy · Action · Tower Defense

Freeman: Guerrilla Warfare
Shared: Action · Strategy · FPS

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

Call to Arms
Shared: Strategy · Action · RTS

BioShock Infinite
Shared: Action · FPS · First-Person

Bee Island
Shared: Strategy · Tower Defense · Action

Taur
Shared: Strategy · Action · Tower Defense

Orcs Must Die!
Shared: Action · Strategy · Tower Defense

Polarity
Shared: Puzzle · Strategy · Action

Total War: WARHAMMER II
Shared: Strategy · RTS · Action

GemCraft - Chasing Shadows
Shared: Strategy · Tower Defense · Action

Sanctum
Shared: Strategy · Tower Defense · Action

Orcs Must Die! 2
Shared: Action · Tower Defense · Strategy

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

Natural Selection 2
Shared: Strategy · Action · FPS

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Minimalist

Command & Conquer 3 Tiberium Wars™
Shared: Strategy · Action · RTS

Infested Planet
Shared: Strategy · Action · Tower Defense

Counter-Strike: Source
Shared: Action · FPS · First-Person

Total War: WARHAMMER III
Shared: Strategy · RTS · Action

Half-Life 2
Shared: Action · FPS · First-Person