This is a nice demo! Very short, but nice. The stage looks absolutely fantastic, I don't know if it's from another game or adapted from something, or if it's original art. If it's original, holy shit, I'd love to see more. The level design is tight, and it plays as well as Sonic Worlds Delta plays, so that's good! I like the title screen, too. The only issue I had were some sound effects not playing, and I had the problem randomly with random sound effects. I've dealt with Sonic Worlds' sound engine, though, so I know it can be a bit of a pain. Keep up the good work!