You control a character moving through a boring black environment, completing some disjointed requests from NPCs and trying to improve your character.
This would be a very lacklustre and boring game, except you're a solar body.
Let me restate that, you are an android aspiring to become a sun (or even more).
This is very clearly the main hook of the game and it is executed well.
You can get asteroids you encounter that are smaller than you to orbit you and have the interesting ability to absorb anything orbiting you. By growing smaller you turn from an asteroid into a planet, into a sun, etc.
Does it make sense from a scientific perspective? Barely.
Is it fun? Yes. Yes it is.
What was especially impressive to me is that you can, should you want to, also become a full solar system, since planets will be able to enter your orbit when you're a star. Combine that with the ability for life to spawn on a planet you can have your own little army of space-faring creatures defending the character (something which you'll need for some of the quests).
The game isn't particularly long, but has nice replayability where you can start a new game as any solar body you've been so far in your previous sessions.
All in all I'd definitely recommend it if you want to be a planet.