Fun game! Nice little spin on selecting power ups when you level up!
I agree with another comment about more SFX to help juice things up. I wish I had another attack for enemies that are too close, but maybe that's me not being super familiar with the genre. Plus it keeps you on the move, which is good!
The visuals are simple and clean. I found myself really getting into weighing my options with which power ups I could afford. Good work!