arrow keys to move square in middle
I had tried making a platformer in Khan Academy and for a Java ascii game of mine, but both failed with wall, floor, and ceiling collisions, so most of these platformers use only floor collision. My goal with this project was to make a platformer engine including wall, floor, and ceiling collisions, and it has those. Although it took me forever to figure this out, and the solution I ended up using was much simpler than my previous ideas. At least now I might be able to use this for platformer collisions outside of Scratch. I got help from different projects after searching "pen platformer engine", but the specific project which helped me the best ways 100% pen platformer engine by a_guy_who_made_games.
