Use left and right arrow keys. 5 levels. At first I wanted to test around with gravity in scratch but then I decided to make game out of it and what other person could this game be about than the man who discovered the laws of gravity, Isaac Newton! Explore the different environments and see how gravity is different in those places, while collecting all the apples.
I hope you enjoy! I am using VERY basic rules for the gravity. This is definitely not how it would be in real life.