Nice beginning.
It took me a moment to understand, that I have to pick up those crystal balls as bullets. And I like that concept of having limited ammunation based on what I take from the ground.
The character and enemies look really nice by the way.
The movement as a little bit unintuitive cause it feels like i follows a strong ADSR curve but diagonal movement doesn't work for me. This one ever playing sound effect as a bit too much for me.