Games like Redder

it's a spaceship management simulation with space and crew combat, planetary visits, anomalous events, quests, and loot! In common: space, open world, sandbox.

A small metroidvania in which you delve deeper into a planet, until you reach it's bottom... In common: metroidvania, exploration, science fiction.

Help Astro find the spaceship pieces using your resizing lantern light. In common: astronaut, space, science fiction.

Lurkers is a chaotic 2D multiplayer sandbox where you can build, battle, and survive! In common: open world, sandbox, horror.

Evacuation is a puzzle game where you try to rescue as many astronauts, so without letting them in a room with aliens or into outerspace. In common: astronaut, space, science fiction.

Build your paradise, have fun with friends & become ultimate tycoon in Paradise Tycoon's multiplayer world! In common: exploration, open world, sandbox.

Sylvie's world was destroyed again. In common: metroidvania, exploration, platform.

Samorost2, the sequel to free browser based game Samorost1 is a short point-and-click adventure in which you must help out a little space gnome as he searches… In common: space, exploration, science fiction.

Star86 is a free online virtual world for kids that can be played in a web browser. In common: space, exploration, sandbox.

Asteroid is an open world action adventure RPG set in space! In common: space, open world, science fiction.