Design-wise, it's pretty linear, with a few enemies here and there. There's no real challenge here, and it's kind of boring. For a first world hack, though, it's not really bad, but the hack as overall, I think, is kind of bad for a submission since its levels are short and the hack itself only has 6 exits. The lenght is the main problem, but for a first world, it's not awfully bad. It's just a bit boring due to the linearity.
Not much can be said for the aesthetics, since the author used the vanilla SMW graphics, palettes included. It's nice overall, I appreciated the fact that levels had enough decoration, so they didn't feel empty.
As only issue I'd like to point out is in the castle level, where there is a small lava pool that doesn't kill you since the author only used the animated surface of it.
Overall, short and easy hack. If you want to spend a few minutes playing an easy hack, go ahead.