In a word, stylish!
Some more screenshots would really help sell it. I almost passed it over but gave it a try because it was web based and I'm glad I did! I had quite a bit of fun with the procedural levels and various abilities. I picked the spray and pray one at the start and the inaccuracy was a nightmare at first but ended up being OP with enough shooting speed upgrades. XD
My only real complaint is that the base movement speed feels really twitchy and it's hard to move accurately. I had lots of opportunities to further increase it but actively avoided them because it was already too much!
A really cool concept and well executed. Great job!