It‘s not unreadable I think. But it takes a little patience. I think the code for this demo is not for new leaners to read, it just so cool to realize these effects in just 110 lines. @Pointfix, if you want to learn something, there are many demos here, with very complete and good documents here for you to read, just try to search~

Aha, much better. You can build up another scenrio for each step you updated. So those people(mostly new leaners maybe) who fellows your video could figure out how things became better and better.

x-direction movement should only happen when the player press the key, not always, and the jump speed is too fast. Try to make things smooth. Any way, very good documentation for new leaners! :-D