Games like P vs NP: Proof by Combat
Games like P vs NP: Proof by Combat include Vampire Survivors, Windowkill, Bit Blaster XL, Geometry Wars: Retro Evolved, and Beat Hazard. We matched them by the tags players give P vs NP: Proof by Combat on Steam (Casual, Arcade, Twin Stick Shooter, Bullet Hell, and Minimalist): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Casual · Arcade

Windowkill
Shared: Arcade · Bullet Hell · Twin Stick Shooter

Bit Blaster XL
Shared: Bullet Hell · Arcade · Casual

Geometry Wars: Retro Evolved
Shared: Arcade · Casual · Twin Stick Shooter

Beat Hazard
Shared: Twin Stick Shooter · Bullet Hell · Music-Based Procedural Generation

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

Rogue: Genesia
Shared: Bullet Hell · Arcade · Twin Stick Shooter

Orbt XL
Shared: Arcade · Casual · Controller

Megabonk
Shared: Bullet Hell · Arcade · Casual

Time Wasters
Shared: Twin Stick Shooter · Bullet Hell · Casual

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

Project Lazarus
Shared: Casual · Bullet Hell · Arcade

BALL x PIT
Shared: Arcade · Bullet Hell · Action

Utopia Must Fall
Shared: Casual · Arcade · Bullet Hell

Boneraiser Minions
Shared: Bullet Hell · Casual · Arcade

Seraph's Last Stand
Shared: Casual · Bullet Hell · Perma Death

Cyberhunt
Shared: Casual · Twin Stick Shooter · Arcade

KILL KNIGHT
Shared: Bullet Hell · Arcade · Twin Stick Shooter

Soulstone Survivors
Shared: Bullet Hell · Arcade · Roguelite

Greedland
Shared: Twin Stick Shooter · Bullet Hell · Casual

AudioSurf
Shared: Casual · Arcade · Music-Based Procedural Generation

Nex Machina
Shared: Twin Stick Shooter · Arcade · Bullet Hell

Temtem: Swarm
Shared: Twin Stick Shooter · Bullet Hell · Arcade

Super Hexagon
Shared: Arcade · Minimalist · Singleplayer