Cool game amiltonbr.
I love some of the effects you have and the way all those shells start piling up next to you when using the machine gun :) The overall experience is pretty good.
Just something to consider : I found your button setup to be not be very intuative. For a QWERTY keyboard you have users jumping with wedding finger, shooting with the middle and crouching with the index.
put your hand on the desk and tap a button with your wedding finger for a while - your hand starts cramping. Alternatively, try jumping and shooting smoothly (with the pistol) at the same time - my hand cant keep up with my brain.
If you dont want to use up arrow for jump and crouch for down arrow (im guessing your saving these keys for ladders), then set crouch to the wedding finger (as you dont crouch very often), jump to middle finger and shoot to index finger (that finger can handle rapid fire).
I know it gets hard when you have multiple keyboard layouts to consider - Im just trying to give you a good impression of playing with a QWERTY.
Sorry for post length :/