I really liked this game; it was both clever and fun to play! It took a while to figure out what I was supposed to do (the goals only appearing with tooltips meant I missed those entirely until lv3, since the first two levels can be brute forced), but once I did, it was very entertaining.
Quite a few people below mention that the divide by itself ship is too "powerful", but I think it is a necessary element if you want to do certain puzzles (such as the primes) without requiring the player to roll endlessly and hope they get the right numbers.
Overall, I think this is a very creative and fun game, if a bit niche in terms of requiring players to like maths! Well done!