Games like Cosmic Gunslinger: Alien Outlaws
Games like Cosmic Gunslinger: Alien Outlaws include Terraria, Vampire Survivors, UnderMine, Skul: The Hero Slayer, and Dead Cells. We matched them by the tags players give Cosmic Gunslinger: Alien Outlaws on Steam (RPG, Action Roguelike, Action, Survival, and Adventure): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Survival · Adventure · 2D

Vampire Survivors
Shared: Action Roguelike · Pixel Graphics · 2D

UnderMine
Shared: Action Roguelike · RPG · Action

Skul: The Hero Slayer
Shared: Action Roguelike · Action · Pixel Graphics

Dead Cells
Shared: Action Roguelike · Adventure · 2D

Hero Siege
Shared: Action Roguelike · RPG · Pixel Graphics

Magicite
Shared: RPG · Action Roguelike · 2D

20 Minutes Till Dawn
Shared: Action Roguelike · Survival · Pixel Graphics

Death Must Die
Shared: Action Roguelike · RPG · Action

Streets of Rogue
Shared: Action Roguelike · RPG · Action

Roguelands
Shared: Action Roguelike · RPG · Action

Forager
Shared: Survival · Pixel Graphics · Adventure

Rogue Legacy
Shared: Action Roguelike · Action · RPG

Heroes of Hammerwatch II
Shared: RPG · Action Roguelike · Action

SKYHILL
Shared: Action Roguelike · Survival · Adventure

Dungreed
Shared: Action Roguelike · Action · Pixel Graphics

Dungeon Munchies
Shared: Action · RPG · Adventure

The Escapists
Shared: Pixel Graphics · Action · 2D

bit Dungeon II
Shared: RPG · Action Roguelike · Action

Megabonk
Shared: Action Roguelike · Survival · Action

Sephiria
Shared: Action Roguelike · RPG · Action

Stoneshard
Shared: RPG · Survival · Pixel Graphics

BlazBlue Entropy Effect
Shared: Action Roguelike · Action · 2D

Last Oasis
Shared: RPG · Survival · Action