Lot's of fun! The number of well executed mechanics is impressive! I think the level balancing is off. The first level took me several tries, and then I beat the other levels in one go. The cheese moon is busted. I didn't see how to export raw materials to other planets, maybe I missed that.
At first, I didn't realize that you had sell the items from your barn. Once the planet is spinning, it's difficult to adjust the rockets, so having a separate interface for that might be helpful. I think your initial focus is off on the opening menu and starting info screen because your buttons look odd when those menus open up.
I would enjoy this without levels and timers just to see how well I could build up my systems over time.