Games like Neonis
Games like Neonis include Halo: Spartan Assault, Halo Infinite, STAR WARS™ Battlefront™ II, Dome Keeper, and Endless Sky. We matched them by the tags players give Neonis on Steam (Top-Down Shooter, Tower Defense, Singleplayer, Action, and Space): closest matches first, and among equally close ones the better-known games.

Halo: Spartan Assault
Shared: Top-Down Shooter · Action · Singleplayer

Halo Infinite
Shared: Singleplayer · Action · Sci-fi

STAR WARS™ Battlefront™ II
Shared: Singleplayer · Space · Action

Dome Keeper
Shared: Singleplayer · Action · Tower Defense

Endless Sky
Shared: Space · Singleplayer · Sci-fi

HELLDIVERS™ 2
Shared: Action · PvE · Space

X-Morph: Defense
Shared: Tower Defense · Action · Top-Down Shooter

Deep Rock Galactic: Survivor
Shared: Top-Down Shooter · Action · PvE

12 is Better Than 6
Shared: Top-Down Shooter · Action · Singleplayer

BALL x PIT
Shared: Action · Arcade · Top-Down Shooter

Warframe
Shared: Action · Free to Play · Singleplayer

Warhammer 40,000: Space Marine 2
Shared: Action · Singleplayer · PvE

Dead Space (2008)
Shared: Action · Space · Singleplayer

Heat Signature
Shared: Space · Action · Top-Down

Titanfall® 2
Shared: Singleplayer · Action · Sci-fi

Call of Duty®: Infinite Warfare
Shared: Action · Space · Singleplayer

Reassembly
Shared: Space · Action · Singleplayer

Space Pirates and Zombies
Shared: Action · Space · Singleplayer

Taur
Shared: Tower Defense · Action · Singleplayer

Cyberhunt
Shared: Action · Arcade · 2D

STAR WARS™ Battlefront II (Classic, 2005)
Shared: Action · Space · Singleplayer

Kingdom Rush - Tower Defense
Shared: Tower Defense · Singleplayer · 2D

Infested Planet
Shared: Tower Defense · Action · Singleplayer

FTL: Faster Than Light
Shared: Space · Singleplayer · Sci-fi