Games like POPTANK
Games like POPTANK include Snake Force, 12 is Better Than 6, Hotline Miami, Escape From Duckov, and My Friend Pedro. We matched them by the tags players give POPTANK on Steam (Top-Down Shooter, Action, Shooter, 2D, and Top-Down): closest matches first, and among equally close ones the better-known games.

Snake Force
Shared: Action · Top-Down Shooter · Shooter

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

Hotline Miami
Shared: Action · Top-Down · Indie

Escape From Duckov
Shared: Action · Top-Down Shooter · Shooter

My Friend Pedro
Shared: Action · Shooter · Indie

Broforce
Shared: Action · 2D · Shooter

Door Kickers
Shared: Action · Top-Down · 2D

The Mean Greens - Plastic Warfare
Shared: Action · Shooter · Funny

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

Hotline Miami 2: Wrong Number
Shared: Action · Top-Down · Top-Down Shooter

ShellShock Live
Shared: Action · 2D · Shooter

Duck Game
Shared: Action · Funny · 2D

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

BioShock Infinite
Shared: Action · Shooter · Singleplayer

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

HELLDIVERS™ Dive Harder Edition
Shared: Top-Down Shooter · Action · Shooter

A Dance of Fire and Ice
Shared: 2D · Indie · Singleplayer

Stick Fight: The Game
Shared: Action · Funny · 2D

RUINER
Shared: Action · Top-Down Shooter · Indie

State of Anarchy
Shared: Action · Top-Down Shooter · Shooter

Kingdom Rush - Tower Defense
Shared: 2D · Action · Funny

Grand Theft Auto V Legacy
Shared: Action · Shooter · Singleplayer

Police Stories
Shared: Action · Top-Down Shooter · Shooter

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