If your open to suggestions, a nice background song would be twilight techno - dimrain47. I used it in a scenario similar to this one, called bouncy. If you wish, you can take it out of there.

Maybe, remove the turnAtEdge() for the bug and have a method that prevents the bug from going past the edge instead. Also, increasing the speed slightly might make the game a bit more playable. Overall good first project.

Nothing is implemented to cause Tobi to die (or reset position) when he falls into a hole. You can go through the whole level underneath the ground...

Jump on it's head. Hit it into the bottom of the screen without hitting your head on the upper spikes. It takes, I believe, 4 hits on easy, 6 on hard.