This is good stuff! I just played through the demo ( ALL of it; not just up until you placed the "End of Demo" guy. ) and it was quite satisfying. The levels were good and the overworld was organized well. I did have a problem with spawnpoints, though. If I died, I always spawned in Donut Plains 1, no matter where I was before. That should be simple to fix if you just set the spawnpoint with a command every time the player enters a level, but it wasn't too bad.
Stay tuned for the footage of my experience. It's about 40 minutes long and the upload speed at my house is not the best. It might pop up tomorrow; I'll notify you when it's ready.
Ahem, thank you, Stetofire, for that lovely Video you posted! It not only showed me that...you know, it WORKS, but it also showed me the many problems within the demo! I shall release a Remastered Demo, so you can enjoy it better! I also noticed you found 2 of the secrets in Donut Plains, one of which you didn't think one could get there! There is a bush you can use to jump onto the pipe, kill the enemy guarding it, and use the lever to open up a secret! At the time of this comment, i'm currently on work on Vanilla Dome, so most of Donut Plains is complete, all but the pipes, and Donut Secret 2.
Furthermore, I also noticed that the music isn't playing for some reason...i find that rather strange...The "steves" you found walking with you are in fact the ones that play the music, they also were supposed to be invisible, but i already fixed that! if you can get the music to play, let me know!
And no, i'm not a fake account, i'm the real deal, i'm just in school at the current time of this comment! See ya!