34 is the best I could get. Very fun game, can't really pick much fault with it.
I guess if I had to then the music is probably a bit out of place and very repetitive, though with a 48h jam game it's hardly fair criticism.
Only other thing would be more variation at later levels since after so many kills when you get the small circle view pretty early on that seems to be the limit in terms of difficulty increase.
Overall very fun and that is what really matters with a game after all.