Well that's a start, here are some ideas for improvements:
- Make the player visible at all times, it's a bit confusing when you start the game and you can't see your planet, I didn't even know I owned one.
- Make the planet grow slower, it easily gets bigger than the whole screen.
- Add friction to the planets, I know it's in space but I think it's frustrating when you want to stop somewhere.
- Add audio, it's often underrated in game jams but some sfx and a background music greatly improve the mood of the game.
- Add some enemies, maybe some fighters, more gameplay elements, etc

I hope you continue working on this! :)

I really don't understand this game. I got allot of workers, but I don't know why, and I don't know what the goal of the game is.