Games like ZAP Master
Games like ZAP Master include Plants vs. Zombies GOTY Edition, Vampire Survivors, Bloons TD 6, Bloons TD 5, and Kingdom Rush - Tower Defense. We matched them by the tags players give ZAP Master on Steam (Indie, Casual, Action, 2D, and Tower Defense): closest matches first, and among equally close ones the better-known games.

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

Vampire Survivors
Shared: Indie · 2D · Casual

Bloons TD 6
Shared: Tower Defense · Singleplayer · Casual

Bloons TD 5
Shared: Tower Defense · Action · Casual

Kingdom Rush - Tower Defense
Shared: Tower Defense · 2D · Singleplayer

Rock 'N' Roll Defense
Shared: Casual · Tower Defense · Action

Game Dev Tycoon
Shared: Indie · Casual · Singleplayer

Zup! S
Shared: Casual · Indie · 2D

Timberman
Shared: Casual · Indie · Action

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

Kingdom Rush Origins - Tower Defense
Shared: Tower Defense · 2D · Casual

Kingdom Rush Frontiers - Tower Defense
Shared: Tower Defense · 2D · Singleplayer

Skul: The Hero Slayer
Shared: Indie · Action · 2D

Door Kickers
Shared: Indie · Action · Singleplayer

The Escapists
Shared: Indie · 2D · Singleplayer

Plague Inc: Evolved
Shared: Indie · Casual · Singleplayer

ShellShock Live
Shared: 2D · Action · Casual

Planes, Bullets and Vodka
Shared: Casual · Action · 2D

Hotline Miami
Shared: Indie · Action · Top-Down

The Binding of Isaac: Rebirth
Shared: Indie · Replay Value · Singleplayer

BEEP
Shared: Indie · 2D · Singleplayer

Balatro
Shared: Singleplayer · Indie · Casual

Cyberhunt
Shared: Indie · Casual · Action

Zup!
Shared: Casual · Indie · 2D