Congrats on your submission! I couldn't get used to the controls and it seems to be really hectic after a while. It reminded me a bit of asteroids with the controls, that was always a difficult one too. One issue I had with the game is that when I would die, the upgrade screen would come up and disappear so fast because I was shooting at the time. I think having a timer on death to give the users a moment to react to being hit would be a good addition to make the gameplay feel more solid. Not game related, but submission related, you might want to add a few screenshots to your game page.