Great entry!
I honestly wasn't expecting much with the barely readable font intro, but then I started playing and it was amazing! The movement, controls and especially upgrade menu were very well thought out and implemented. Thanks so much for making it hold to fire also!
Obviously lack of audio leaves some to be desired. And it would be really nice if the mouse pointer locked and hid away so you're not keeping track of it to aim with.
Otherwise this is my favorite entry that I've played so far!