I have actually been wondering about how this hack was going, mainly because of your inclusion of the Shadow Mario character. How did you pull that off? I don't really get how you make it move.
Overall, I like the basic ideas behind your level design, but the first level seems pretty enemy-heavy and busy for a Level 1-1, but that's just me. If you're going for something harder, then it makes sense.
[?] Miscellaneous Helpful Hints
If I moderated your hack, there was apparently a 90 percent chance it was rejected.