Wow good catch, I completely missed that bug, thanks for playing and for your late QA testing !
As for the difficulty I wholeheartedly agree. I tend to undershot it a lot during jam so that everyone can see the entire game in about 5-10 minutes. It's a double edge sword though as it makes the game pretty boring, bullets were quite a bit faster and went through environment during the early versions, it was a entirely different animal.
Thanks a lot for sticking around however, really liked your entry