It took me quite a lot of time to understand the mechanic. I didn't understand at first that I can control the penny with the mouse, and that the speed of the mouse movement can fling me more or less far. It's not something intuitive, so it should be explained by the game. (I nearly gave up)
It's still quite hard after understanding, but there are some cool things with the mechanic (killing projectiles and using the penny coming back to quicky propel you to the next challenge for example).
Not sure the jump is very useful, and it's part of what is confusing I think. Perhaps the penny should even be the only control and level design adapted for this ? (it feels a little bit like you don't really assume your design idea).