Hi there!!
It is just amazing to see games made with the assets I created and what you've got here is crazy awesome! Controls are responsive, gameplay is dynamic, I love the addition of a shop instead of the usual random upgrades and the visual assets were used brilliantly :)
I gotta say though, I found it real difficult, even in the starting waves hahaha I am not the best bullet hell player, but I felt the difficulty scaled too fast. Maybe tune it down a little, giving the player a bit more time to get to know each enemy type, movement and shot pattern.
Anyway, amazing creation. Keep up the good work!!