Games like UnTANKable
Games like UnTANKable include Deployment, Zombieville USA 3D, ShellShock Live, Cyberhunt, and SYNTHETIK 2. We matched them by the tags players give UnTANKable on Steam (Indie, Tanks, Top-Down Shooter, PvE, and Action): closest matches first, and among equally close ones the better-known games.

Deployment
Shared: Top-Down Shooter · Action · Arena Shooter

Zombieville USA 3D
Shared: Top-Down Shooter · Action · Arcade

ShellShock Live
Shared: Tanks · Action · Casual

Cyberhunt
Shared: Indie · Action · Casual

SYNTHETIK 2
Shared: Top-Down Shooter · Twin Stick Shooter · Indie

SYNTHETIK: Legion Rising
Shared: Indie · Top-Down Shooter · Action

SNKRX
Shared: Top-Down Shooter · Arena Shooter · Arcade

The Ascent
Shared: Top-Down Shooter · Action · Indie

Deep Rock Galactic: Survivor
Shared: Top-Down Shooter · PvE · Action

RUNNING WITH RIFLES
Shared: Top-Down Shooter · Action · Indie

RUINER
Shared: Top-Down Shooter · Indie · Action

GrandChase
Shared: PvE · Action · Casual

The Hong Kong Massacre
Shared: Action · Indie · Top-Down Shooter

Halo: Spartan Assault
Shared: Top-Down Shooter · Action · Arcade

12 is Better Than 6
Shared: Action · Top-Down Shooter · Indie

State of Anarchy: Master of Mayhem
Shared: Top-Down Shooter · Action · Indie

How to Fish
Shared: Indie · Shooter · Action

Hotline Miami
Shared: Indie · Action · Top-Down

Crab Champions
Shared: Arcade · Indie · Action

OPERATOR
Shared: Action · PvE · Shooter

Disney Speedstorm
Shared: Action · Arcade · Casual

Yet Another Zombie Survivors
Shared: Top-Down Shooter · Indie · Arcade

ATLYSS
Shared: Character Customization · Action · Indie

Splatter - Zombiecalypse Now
Shared: Top-Down Shooter · Indie · Action