Games like Alchemy Survivors
Games like Alchemy Survivors include The Spell Brigade, Megabonk, Gunfire Reborn, PAYDAY 2, and BALL x PIT. We matched them by the tags players give Alchemy Survivors on Steam (Online Co-Op, Bullet Heaven, Action, Crafting, and Looter Shooter): closest matches first, and among equally close ones the better-known games.

The Spell Brigade
Shared: Online Co-Op · Bullet Heaven · Co-op

Megabonk
Shared: Bullet Heaven · Action · Roguelike

Gunfire Reborn
Shared: Online Co-Op · Co-op · Looter Shooter

PAYDAY 2
Shared: Co-op · Action · Online Co-Op

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Risk of Rain 2
Shared: Co-op · Action · Online Co-Op

Vampire Survivors
Shared: Bullet Hell · Action · Pixel Graphics

Terraria
Shared: Crafting · Co-op · 2D

Soulstone Survivors
Shared: Bullet Heaven · Crafting · Bullet Hell

Starship Troopers: Extermination
Shared: Online Co-Op · Action · Co-op

Crab Champions
Shared: Looter Shooter · Co-op · Arcade

Halls of Torment
Shared: Action · Bullet Hell · Bullet Heaven

Don't Starve Together
Shared: Co-op · Online Co-Op · Crafting

Castle Crashers®
Shared: Online Co-Op · Co-op · 2D

Death Must Die
Shared: Bullet Heaven · Bullet Hell · Action

Broforce
Shared: Action · Co-op · 2D

Borderlands 2
Shared: Action · Co-op · Looter Shooter

Warframe
Shared: Looter Shooter · Action · Online Co-Op

Ravenswatch
Shared: Co-op · Online Co-Op · Action

The Escapists 2
Shared: Online Co-Op · Co-op · Crafting

Risk of Rain Returns
Shared: Online Co-Op · Looter Shooter · Action

Streets of Rage 4
Shared: Action · Online Co-Op · Arcade

Enter the Gungeon
Shared: Bullet Hell · Roguelike · Co-op

ELDEN RING NIGHTREIGN
Shared: Online Co-Op · Co-op · Action