Short one indeed, maybe too short for a place in the section, but I'll talk about this later.
This hack's level design isn't this bad, except that the levels felt like bonus levels rather than actual levels: 1-UP lives everywhere, lots of coins and powerups... that's my main complaint. The challenge factor is totally absent; I know you want to make the player feel at ease in the first world, but maybe we're exhaggerating a bit here. Either remove some of the lives/coins/powerups, to make the "rewards" more reasonable, or make said sections harder.
Apart from this, I also noticed that you didn't have much going on in the "late" levels: as Jack said as well, the first level is okay, but having more or less the same "gimmick" ideas over and over again it's kind of boring (to make it clearer, you basically used P-Switch everywhere. Using it 2-3 times may be okay, but using for all the levels of the hack is bad, since it feels repetitive and brings nothing new to the player experience). Overall, a design that needs some more ideas: the levels structure could go, but you need other gimmicks, or it ends being repetitive = boring.
Aesthetics looked poor. It's sad that you had no background in most of the levels, which is my main complaint. At least, you managed to keep an uniform cartoonish style, which I appreciated. The only thing you need is to make it more rich, like adding more decorations. For now, though, it's not an appealing aesthetic; you really should work on it more, but watch out and keep the cartoonish style.
Jack managed to point out every single issues, which I found as well. Be sure to fix them, especially this one
. You can't force the player to die if he can't pass here. I'd make a side screen exit, that would be the best solution.
A thing I'd like to highlight here before ending the review is the lenght. 6 exits are way too low for a reasonable lenght, and since this is a demo, you have no excuses to include more levels, maybe another world or two. This concernes me a lot, and probably the strongest cause of my verdict.
Difficulty is easy
, the difficulty curve is more or less good.
Due to the lenght and for the poor design, I'd reject
this hack. Give to your levels more ideas and gimmicks, the central hosts lots of stuff you could use; also don't forget to make more levels in your next submission.