What a nice little game!
Love how you kept things simple while using an inovative movement / attack mecanic. The art and souds are super cute too!
The game feels very difficult, not so much that it becomes frustrating, but I think the main issue there is that upgrades don't do enough compared to the increase in monster quantity. 10% to moon size? Why not 100%?
I had a nice time and tried several time to go further, so it's clearly a good game! Great job!