The crash has been fixed on our end, but we can't upload another version of the game since the jam is still ongoing :(. There is a version where this is fixed on DuskBunny's Newgrounds. We have no clue why the shotgun is bugged in level 2 though, but you should be able to walljump to the buttton as well :). I'm glad you like our game, and hopefully you can now finish it!