Games like Nebulon
Games like Nebulon include The Escapists, Gunpoint, Papers, Please, Baba Is You, and FTL: Faster Than Light. We matched them by the tags players give Nebulon on Steam (Strategy, Puzzle, Space, 2D, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

The Escapists
Shared: Strategy · Pixel Graphics · 2D

Gunpoint
Shared: Puzzle · 2D · Indie

Papers, Please
Shared: Indie · Pixel Graphics · Puzzle

Baba Is You
Shared: Puzzle · Indie · Singleplayer

FTL: Faster Than Light
Shared: Strategy · Space · Singleplayer

The Escapists 2
Shared: Strategy · Pixel Graphics · 2D

Cosmoteer: Starship Architect & Commander
Shared: Space · Singleplayer · Strategy

Mini Metro
Shared: Strategy · Puzzle · Singleplayer

Into the Breach
Shared: Strategy · Pixel Graphics · Puzzle

OneShot
Shared: Pixel Graphics · Puzzle · Indie

Plants vs. Zombies GOTY Edition
Shared: Strategy · Singleplayer · 2D

Zombie Night Terror
Shared: Strategy · Pixel Graphics · Puzzle

There Is No Game: Wrong Dimension
Shared: Puzzle · Indie · Pixel Graphics

Zup! S
Shared: Puzzle · 2D · Indie

Crying Suns
Shared: Strategy · Space · Pixel Graphics

Dungeon Warfare
Shared: Strategy · 2D · Pixel Graphics

Pony Island
Shared: Puzzle · Pixel Graphics · Indie

Balatro
Shared: Strategy · Singleplayer · Pixel Graphics

Out There Somewhere
Shared: Puzzle · Pixel Graphics · 2D

Waveform
Shared: Puzzle · Strategy · Indie

Please, Don’t Touch Anything
Shared: Puzzle · Pixel Graphics · Indie

Defy Gravity Extended
Shared: Puzzle · Space · 2D

FEZ
Shared: Puzzle · Pixel Graphics · Indie

Firework
Shared: Puzzle · 2D · Indie