Great game and concept! It took me a second try, and reading the description to realize you could shoot with the arrow keys. After that, I had a great time.
The only thing I didn't understand was the Burn upgrade. At first, I thought it was something I was losing rather than an upgrade. For example, it said I could burn the homing shots, but I thought I already had homing, so I wasn't sure what it meant.
Overall, it's a great game, and I had a lot of fun playing it!