Games like Spelp
Games like Spelp include Deep Rock Galactic: Survivor, BALL x PIT, Brotato, Vampire Survivors, and Megabonk. We matched them by the tags players give Spelp on Steam (Arena Shooter, Bullet Hell, Top-Down Shooter, PvE, and Arcade): closest matches first, and among equally close ones the better-known games.

Deep Rock Galactic: Survivor
Shared: Bullet Hell · Top-Down Shooter · Arena Shooter

BALL x PIT
Shared: Bullet Hell · Action · Arcade

Brotato
Shared: Bullet Hell · Roguelike · Arena Shooter

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · Roguelike

Megabonk
Shared: Bullet Hell · Roguelike · Action

Nova Drift
Shared: Bullet Hell · Arena Shooter · Arcade

Glyphica: Typing Survival
Shared: Arena Shooter · Bullet Hell · Top-Down Shooter

Nuclear Throne
Shared: Bullet Hell · Roguelike · Top-Down Shooter

Halls of Torment
Shared: Bullet Hell · Roguelike · Pixel Graphics

Enter the Gungeon
Shared: Bullet Hell · Roguelike · Pixel Graphics

Chippy
Shared: Bullet Hell · Arena Shooter · Top-Down Shooter

Sky Force Reloaded
Shared: Bullet Hell · Top-Down Shooter · Arcade

Vital Shell
Shared: Bullet Hell · Arena Shooter · Top-Down Shooter

UBERMOSH:BLACK
Shared: Bullet Hell · Action · Arcade

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

UBERMOSH
Shared: Action · Arcade · Pixel Graphics

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

Kill The Crows
Shared: Action · Top-Down Shooter · Arcade

Arms of God
Shared: Top-Down Shooter · Bullet Hell · Arena Shooter

Geometry Arena
Shared: Arena Shooter · Top-Down Shooter · Bullet Hell

UBERMOSH Vol.5
Shared: Arcade · Action · Bullet Hell

UBERMOSH Vol.3
Shared: Action · Arcade · Bullet Hell

Rogue: Genesia
Shared: Bullet Hell · Arcade · PvE

Maniac
Shared: Top-Down Shooter · Bullet Hell · Top-Down