Games like Astrozombies
Games like Astrozombies include Half-Life 2, Zombotron, SANABI, Black Mesa, and Rogue Legacy 2. We matched them by the tags players give Astrozombies on Steam (Action, 2D, Old School, Sci-fi, and Adventure): closest matches first, and among equally close ones the better-known games.

Half-Life 2
Shared: Action · Sci-fi · Singleplayer

Zombotron
Shared: Action · 2D · Adventure

SANABI
Shared: Action · 2D · Adventure

Black Mesa
Shared: Action · Sci-fi · Singleplayer

Rogue Legacy 2
Shared: Action · Arcade · Indie

Exit the Gungeon
Shared: Action · Indie · Arcade

STAR WARS Jedi: Survivor™
Shared: Action · Adventure · Singleplayer

BEEP
Shared: 2D · Indie · Adventure

Deliver Us The Moon
Shared: Action · Adventure · Indie

Cyberhunt
Shared: Action · Indie · Adventure

Half-Life: Blue Shift
Shared: Action · Sci-fi · Singleplayer

ICEY
Shared: Action · Adventure · 2D

Skul: The Hero Slayer
Shared: Action · Indie · 2D

Shovel Knight: Treasure Trove
Shared: 2D · Action · Indie

Deadlight
Shared: Action · Indie · Adventure

Dust: An Elysian Tail
Shared: Action · 2D · Indie

Volgarr the Viking
Shared: Action · 2D · Indie

Iron Marines
Shared: Action · Sci-fi · 2D

Chorus
Shared: Action · Adventure · Indie

PRAGMATA
Shared: Action · Sci-fi · Adventure

Hollow Knight: Silksong
Shared: 2D · Indie · Singleplayer

Hollow Knight
Shared: 2D · Indie · Singleplayer

MO:Astray
Shared: Action · Indie · Adventure

Half-Life: Opposing Force
Shared: Action · Sci-fi · Singleplayer