Games like Project CyberSky
Games like Project CyberSky include Turbo Overkill, UBERMOSH, Broforce, PUBG: BATTLEGROUNDS, and Huntdown. We matched them by the tags players give Project CyberSky on Steam (Action, Shooter, Twin Stick Shooter, 3D, and Abstract): closest matches first, and among equally close ones the better-known games.

Turbo Overkill
Shared: Action · Shooter · Cyberpunk

UBERMOSH
Shared: Action · Pixel Graphics · Cyberpunk

Broforce
Shared: Action · Pixel Graphics · Shooter

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Strategy

Huntdown
Shared: Shooter · Action · Pixel Graphics

SUPERHOT
Shared: Action · Shooter · Minimalist

X-Morph: Defense
Shared: Action · Twin Stick Shooter · Shooter

The Ascent
Shared: Action · Shooter · Cyberpunk

Black Mesa
Shared: Action · Shooter · Sci-fi

RUINER
Shared: Action · Twin Stick Shooter · Cyberpunk

Halo: Spartan Assault
Shared: Action · Shooter · Twin Stick Shooter

Katana ZERO
Shared: Action · Pixel Graphics · Cyberpunk

SANABI
Shared: Action · Pixel Graphics · Cyberpunk

COMPOUND
Shared: Action · Shooter · 3D

Door Kickers: Action Squad
Shared: Action · Shooter · Pixel Graphics

Warhammer 40,000: Boltgun
Shared: Shooter · Action · Pixel Graphics

Crysis Remastered
Shared: Action · Shooter · Aliens

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

METAL EDEN
Shared: Action · Shooter · 3D

Half-Life: Blue Shift
Shared: Action · Shooter · Aliens

Hotline Miami
Shared: Action · Pixel Graphics · Indie

Aliens: Fireteam Elite
Shared: Shooter · Action · Aliens

Brigador: Up-Armored Edition
Shared: Action · Twin Stick Shooter · Cyberpunk

EARTH DEFENSE FORCE 6
Shared: Action · Shooter · 3D