I think the game is quite fun. It reminds me a bit of cookie clicker because of the numbers going up and up. Also, props for the inclusion of a tutorial, it explained everything pretty well and the pictures were a nice touch. By the way: The graphics are really cool! I also liked the small touch that during a long flight the ship would move slower. I also liked the humour of the game as well, for example the dialogue of the guy who gave the quests and the names like "MarsMart".
The color of the boxes behind the items was a bit glitchy at times, but that's not a big issue. Also, somehow the credits number got a lot of decimal places, even though all prices are integers? Not sure what's going on there.
All in all, I think the game ended up very good. If you do want to continue working on it, consider doing something so that the game doesn't feel as repetetive.