Hello !
So I played your game and enjoyed it ! What I really like is the setting and the kind of celeste atmosphere, what I also do like is the fact that you used construct 3 for a game jam like that. I really think it was a good move to make a lot of content quick especialy since you are completly on your own on that one. I also enjoy the music a lot.
There still are some flaws and I hate to finish by that but here I am in my message. I find that the game by its system gets kinda repetitive, if you are lucky you just go to the planet section and farm ressources without going into any trouble and if you are not you get a little swarm of ships and they are way too fast... Well not really, the thing is since the camera is very close to your character you can't react and kill them before they hit you and that's really too bad. It's nice that dying is not that punitive since you could just lose everything on your planet but still having to farm up again is frustrating in my opinion. Also I find the sound design to be a bit lacking and the sound of mining a bit strong.
Seeing your planet grow with that much content and how you can use your ressources to build everything is super awesome though.
Anyway here's some suggestions : I think that upgrading your planet should upgrade your character, for instance the view around your character, the size of your lasers, the amount of ressources you get by clicking, the speed... all of that would make the grinding much more fun I feel like. It is indeed easy but at least you get a sense of progress outside of your planet and you feel like you're getting stronger. I think that's possible with the amount of time of the jam. NOW what would be even better would be different types of enemies and hazards to put some more action in the exploration but that I feel would require some extra time or help.
I hope you find all this usefull and I wish you good luck in the future !