Use the left and right arrow keys to move, and play with the sliders. It's fun to set the gravity to -.5 and fly really high, and then set it to 1, you crash to the ground. If you go too high you fall straight through the world. :D
Obviously, thanks to @griffpatch All I did was add a few sliders. Have fun, and please ❤️ and ⭐️ !!
