I'm really only saying this because I have Speedrun it recently but if we added the demo version, it could be fun for some players considering how short it is. we already have the demo levels so why not add the full demo?

I completely agree! I found a shortcut on the demos hub world that skips levels 1 4 5 6 7 and 8

I found a shortcut that skips level 3 as well, beat it in under 2 minutes. Its on YouTube that you can probably find. But yeah it would be cool if it was added.