Games like Pengun
Games like Pengun include Marvel Rivals, Plants vs. Zombies: Battle for Neighborville™, Bit Blaster XL, Planes, Bullets and Vodka, and Kingdom Rush - Tower Defense. We matched them by the tags players give Pengun on Steam (Action, Casual, Shooter, Tower Defense, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Marvel Rivals
Shared: Hero Shooter · Action · Third-Person Shooter

Plants vs. Zombies: Battle for Neighborville™
Shared: Shooter · Casual · Hero Shooter

Bit Blaster XL
Shared: Bullet Hell · Shooter · Shoot 'Em Up

Planes, Bullets and Vodka
Shared: Action · Casual · Bullet Hell

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

Vampire Survivors
Shared: Bullet Hell · Casual · Action

Bloons TD 6
Shared: Tower Defense · Casual · 3D

Utopia Must Fall
Shared: Casual · Tower Defense · Action

Grand Theft Auto V Legacy
Shared: Action · Shooter · Third-Person Shooter

HELLDIVERS™ 2
Shared: Action · Shooter · Third-Person Shooter

s&box
Shared: Casual · Action · Shooter

Orcs Must Die!
Shared: Action · Tower Defense · Third-Person Shooter

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Third-Person Shooter

POSTAL: Brain Damaged
Shared: Action · Shooter · Shoot 'Em Up

Paladins®
Shared: Action · Hero Shooter · Shooter

ShellShock Live
Shared: Action · Shooter · Casual

LUFTRAUSERS
Shared: Action · Bullet Hell · Shoot 'Em Up

The Mean Greens - Plastic Warfare
Shared: Action · Shooter · Third-Person Shooter

Broforce
Shared: Action · Shooter · 2D

Chicken Invaders 5
Shared: Action · Casual · Shoot 'Em Up

Orcs Must Die! 2
Shared: Action · Tower Defense · Third-Person Shooter

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Casual · 2D

Cuphead
Shared: Cartoon · 2D · Bullet Hell

Commando Collection
Shared: Action · Shooter · Bullet Hell