I hate everyone listed in the credits :)
Srsly, there did seem to be something a little bit off about the physics of gunfire momentum. I can't quite put my finger on it, but when I was going through the level with the long spike-walled corridors it seemed like I was losing altitude when the mouse was behind and below the guy but I would gain altitude when the mouse is at the same y-coordinate but directly below or in front of and below the guy, but I would've expected them to maintain the same altitude if you're calculating force as (distance from player to mouse) x (horizontal or vertical component of direction). It also seemed a little weird during the first big bossfight, although it's much harder for me to put my finger on exactly why.
If the game is still in development then it seems like there's some room to expand on the different uses of the different types of guns in later levels. And, you posted a game on NewGrounds without a cock joke when it has a freakin' statue of Michelangelo's David? Missed opportunity...