More levels and better physics

This update contains two major improvements. First,  the physics was a bit broken in the previous version and there were complaints that the main character Rubber Man was nearly impossible to controll. To improve on that I added some air resistance, but only a small resistance since otherwise the game became slow and sluggish. Second, seven more levels were added such that there is now ten levels in total. There were too few accoring to many comments in Fireside Jam 2022, where I first submitted the game. It is still a prototype, but hopefully a more playable one.