Games like Spaceship Ace Pilot
Games like Spaceship Ace Pilot include Kerbal Space Program, Universe Sandbox, Space Engineers, Garry's Mod, and Human Fall Flat. We matched them by the tags players give Spaceship Ace Pilot on Steam (Side Scroller, Puzzle Platformer, Sandbox, Action, and Space): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Sandbox · Space · Simulation

Universe Sandbox
Shared: Sandbox · Space · Simulation

Space Engineers
Shared: Sandbox · Space · Simulation

Garry's Mod
Shared: Sandbox · Physics · Casual

Human Fall Flat
Shared: Sandbox · Puzzle Platformer · Physics

People Playground
Shared: Sandbox · Physics · Simulation

Wobbly Life
Shared: Sandbox · Adventure · Simulation

Solar 2
Shared: Space · Sandbox · Casual

Totally Accurate Battle Simulator
Shared: Sandbox · Simulation · Physics

Spaceflight Simulator
Shared: Sandbox · Space · Simulation

Elite Dangerous
Shared: Space · Space Sim · Simulation

Goat Simulator
Shared: Sandbox · Simulation · Casual

Kerbal Space Program 2
Shared: Sandbox · Space · Physics

Trailmakers
Shared: Space · Action · Sandbox

SPORE™
Shared: Sandbox · Space · Simulation

Starbound
Shared: Sandbox · Space · Adventure

Hardspace: Shipbreaker
Shared: Space · Sandbox · Simulation

Defy Gravity Extended
Shared: Puzzle Platformer · Space · Action

Universe Sandbox
Shared: Sandbox · Space · Simulation

X Rebirth
Shared: Space · Action · Simulation

SPORE™ Galactic Adventures
Shared: Action · Space · Simulation

BONEWORKS
Shared: Sandbox · Action · Physics

Noita
Shared: Sandbox · Physics · Action

EVE Online
Shared: Space · Space Sim · Adventure