Oh boy, this is a fun one. Well, firstly with the things I wish the game had.
- A leaderboard (this is an awesome project: https://danqzq.itch.io/leaderboard-creator)
- A way to skip to the next round and browse the shop without moving my hands from the keyboard to mouse
And now to the positives
- I love the aesthetic of the player character and the enemies
- I love the way you implemented enemy scaling, kudos to that
- I love the way the combo mechanic encouraged maxing out the numbers, basically, makes it a lot more fun to plan your next moves