Games like Avoid The Stalin's Purge
Games like Avoid The Stalin's Purge include Vampire Survivors, Planes, Bullets and Vodka, That's not my Neighbor, Exit the Gungeon, and Bit Blaster XL. We matched them by the tags players give Avoid The Stalin's Purge on Steam (2D Platformer, Bullet Hell, Arcade, 2D, and Casual): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · 2D · Arcade

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

That's not my Neighbor
Shared: Casual · Horror · 2D

Exit the Gungeon
Shared: Arcade · Bullet Hell · 2D

Bit Blaster XL
Shared: Bullet Hell · Arcade · 2D

BALL x PIT
Shared: Arcade · Bullet Hell · 2D

Minishoot' Adventures
Shared: Bullet Hell · Top-Down · 2D

LUFTRAUSERS
Shared: Bullet Hell · Arcade · 2D

Rogue: Genesia
Shared: Bullet Hell · Arcade · 2D

Commando Collection
Shared: Bullet Hell · Arcade · 2D

Cookie Clicker
Shared: Casual · Horror · 2D

Razortron 2000
Shared: Casual · Arcade · 2D

Boneraiser Minions
Shared: Bullet Hell · 2D · Arcade

Space Rock Breaker
Shared: Arcade · Casual · Top-Down

Shelldiver
Shared: Casual · Arcade · 2D

Twin Shot Deluxe
Shared: 2D Platformer · Arcade · Casual

Cursorblade
Shared: Bullet Hell · Arcade · 2D

Cyberhunt
Shared: Casual · Arcade · 2D

Geometry Wars: Retro Evolved
Shared: Arcade · Bullet Hell · Casual

Peggle Deluxe
Shared: Arcade · Casual · 2D

To The Core
Shared: Arcade · 2D · Casual

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: Arcade · 2D · Casual

Utopia Must Fall
Shared: Arcade · Casual · Bullet Hell

Halls of Torment
Shared: Bullet Hell · Arcade · Top-Down