Probably one of my favourite submissions i've tried - controls really well and I actually quite like the art. If you wanted to add more to this maybe you could add some kind of upgrade system, or varying difficulties of enemies in a wave style system, which could then open up a leaderboard.
I'm not particularly sure why but at some point I tabbed in and out of the game and the space bar stopped being registered - this could be an issue on either end but overall I thought it was worth mentioning in case other people struggled with this also. Nice job Elliot!