Very interesting concept, a couple notes. I would make it so you can change the volume, if not start the volume at a lower volume because my ears haha. Secondly everytime I shoot it either launces me into space and I lose or I don't go far enough. Overall fun concept though.
Thanks for playing! If I have time tomorrow I'll add a volume control. As for controlling the movement, you might be pressing and releasing right away. When you press the mouse button you fly away from the crosshair, but when you release you fly up, so pressing and releasing quickly could be causing you problems. It's a tricky game of getting the timings of the two actions right.