Click the square think and move him somewhere above the green part on the bottom and then watch him fall down :) Just made it so you can move him freely :) I still would recommend Fullscreen, though.
I was thinking about one Physics lesson I had last year about Earth's acceleration and so I decided to make a project about it! BTW Earth's gravity acceleration is approx. +6MPS/S. That's what my textbook said and the internet says approx. +9MPS/S My project's gravitational pull is exactly +0.5 Pixels every second/Second