It took me quite a while to understand your game. Eventually I found out that shooting a coin shoots you in the opposite direction, and then it became quite an easy game. It seems to be that the further from the character I shoot, the more the force upwards is, which might be a bug? Also, the AD keys don't work for me, only the arrow keys.

After I figured your game out, it seemed quite enjoyable. Nice graphics, nice sounds. Controls could use some work, but overall a nice game!