Wonderful presentation and execution! I feel like having more control over where the weapons fired would have been a lot more satisfying and still maintained that 'out of control' feeling.
For a different spin on your concept, you should check out 'Press SPACE' if you haven't already:
(I'm not affiliated with that game, I just stumbled upon both and thought you might wanna see someone else's take on it)
Congrats on a great submission!