Games like Astar Solis
Games like Astar Solis include Bit Blaster XL, LUFTRAUSERS, Vampire Survivors, Nova Drift, and Star Saviors. We matched them by the tags players give Astar Solis on Steam (Bullet Hell, Action, Shoot 'Em Up, Singleplayer, and Shooter): closest matches first, and among equally close ones the better-known games.

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

LUFTRAUSERS
Shared: Bullet Hell · Action · Arcade

Vampire Survivors
Shared: Bullet Hell · Singleplayer · 2D

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Arcade

Star Saviors
Shared: Bullet Hell · Shoot 'Em Up · Action

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Bullet Hell

BALL x PIT
Shared: Action · Bullet Hell · Arcade

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

Revolution Ace
Shared: Action · Shoot 'Em Up · Bullet Hell

DRAINUS
Shared: Action · Shoot 'Em Up · Singleplayer

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

Exit the Gungeon
Shared: Action · Bullet Hell · Arcade

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Action · Shoot 'Em Up

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Shoot 'Em Up · Action

Touhou Kinjoukyou ~ Fossilized Wonders.
Shared: Bullet Hell · Shoot 'Em Up · Action

Beat Hazard
Shared: Bullet Hell · Shoot 'Em Up · Action

Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Action · Bullet Hell · Shoot 'Em Up

Windowkill
Shared: Action · Bullet Hell · Arcade

Sky Force Reloaded
Shared: Bullet Hell · Shoot 'Em Up · Arcade

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

Sine Mora
Shared: Bullet Hell · Shoot 'Em Up · Action

Jets'n'Guns Gold
Shared: Shoot 'Em Up · Action · Bullet Hell

Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Bullet Hell · Shoot 'Em Up · Singleplayer

Awaria
Shared: Bullet Hell · Action · 2D

