Games like Arrowstorm Ascendant
Games like Arrowstorm Ascendant include Vampire Survivors, Seraph's Last Stand, Megabonk, Boneraiser Minions, and Halls of Torment. We matched them by the tags players give Arrowstorm Ascendant on Steam (Casual, Arcade, Action Roguelike, Bullet Hell, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

Seraph's Last Stand
Shared: Casual · Action Roguelike · Bullet Hell

Megabonk
Shared: Action Roguelike · Bullet Hell · Arcade

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

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

Rocket Rats
Shared: Action Roguelike · Casual · Bullet Hell

BALL x PIT
Shared: Arcade · Bullet Hell · Action Roguelike

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

Death Must Die
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

Brotato
Shared: Action Roguelike · Bullet Hell · Singleplayer

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

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Pixel Graphics · 2D

Desktop Survivors 98
Shared: Action Roguelike · Casual · Bullet Hell

Downwell
Shared: Action Roguelike · Arcade · Pixel Graphics

Realm of the Mad God Exalt
Shared: Pixel Graphics · Bullet Hell · Action Roguelike

Timberman
Shared: Casual · Pixel Graphics · Arcade

Dead Cells
Shared: Action Roguelike · 2D · Pixel Graphics

Nova Drift
Shared: Arcade · Bullet Hell · Action Roguelike

Karate Survivor
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

Asgard's Fall — Viking Survivors
Shared: Action Roguelike · Casual · Bullet Hell

Astro Prospector
Shared: Casual · Action Roguelike · Bullet Hell

LUFTRAUSERS
Shared: Arcade · Bullet Hell · 2D

Noobs Want to Live
Shared: Bullet Hell · Casual · Action Roguelike

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Casual