Definitely one of the most enjoyable games I have played in the jam so far. I played ~30-40 minutes yesterday and came back for more of the gameplay. Amazing game mechanic with the shield orbs acting like bullets, and the polishing on them is extremely good aswell.
I really, really enjoyed the gameplay loop---classic upgrade game but the base mechanic is so fun!
I don't know if I noticed it correctly, but some levels give significantly more coins than others although having the same difficulty(excluding boss levels). Maybe some transitional levels/balancing of the levels could be cool, but I could have just saw the coin count wrong.
Great job!