yeah, I thing there is still some work needed here :)
having two guns is a nice vision, but a lot of minor things are bugging (getting hung up on ledges, screen transition, esp. to the left, etc)
and teaching new mechanics while being in the middle of a jump after a screen transition ist just pure evil. there wasn't even a way up again, right? so I had to restart the game. In the end I managed to get to the boss by sliding around in the pit offscreen …
PS: why does the blue bullet have 'bullet drop', and the red one doesn't?