Games like SPINGUN
Games like SPINGUN include Bit Blaster XL, Planes, Bullets and Vodka, Super Hexagon, Nova Drift, and LUFTRAUSERS. We matched them by the tags players give SPINGUN on Steam (Arcade, Shoot 'Em Up, Bullet Hell, Score Attack, and Intentionally Awkward Controls): closest matches first, and among equally close ones the better-known games.
Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Arcade · Bullet Hell
Super Hexagon
Shared: Arcade · Difficult · Fast-Paced
Nova Drift
Shared: Shoot 'Em Up · Bullet Hell · Arcade
LUFTRAUSERS
Shared: Arcade · Bullet Hell · Shoot 'Em Up
Ikaruga
Shared: Shoot 'Em Up · Arcade · Bullet Hell
Swarmlake
Shared: Arcade · Bullet Hell · Fast-Paced
Savant - Ascent
Shared: Shoot 'Em Up · Score Attack · Bullet Hell
ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Star Saviors
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Chippy
Shared: Bullet Hell · Shoot 'Em Up · Arcade
Sky Force Reloaded
Shared: Arcade · Shoot 'Em Up · Bullet Hell
Vampire Survivors
Shared: Bullet Hell · Arcade · Indie
Furi
Shared: Bullet Hell · Shoot 'Em Up · Difficult
Mushihimesama
Shared: Shoot 'Em Up · Arcade · Bullet Hell
HYPER DEMON
Shared: Fast-Paced · Score Attack · Difficult
Waves
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Orbt XL
Shared: Arcade · Difficult · Score Attack
UBERMOSH Vol.5
Shared: Arcade · Bullet Hell · Fast-Paced
Geometry Wars: Retro Evolved
Shared: Arcade · Bullet Hell · Shoot 'Em Up
Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Bullet Hell · Shoot 'Em Up · Difficult
Touhou Kinjoukyou ～ Fossilized Wonders.
Shared: Shoot 'Em Up · Bullet Hell · Arcade
XENOTILT: HOSTILE PINBALL ACTION
Shared: Arcade · Bullet Hell · Shoot 'Em Up
Revolution Ace
Shared: Shoot 'Em Up · Bullet Hell · Arcade