Press space to go up, you will automatically start falling once you release the space bar.
Scratch: How did you make this project? Me: By placing blocks, you should know this already.. Also, I would like to credit @griffpatch because he is how I learned gravity and stuff in this very basic block coding script, so thank you Griffpatch. Oh, and I forgot to mention, all of the sprite work was done by my fellow friend: me at 1:10 AM.
