Also reviewing it.
Review - Sunset Fields
This might need some work. It had some potential design-wise, but the whole silhouette gimmick kinda ruined it. While it has some decent design, for the most part the level is very confusing, due to some of the decorations and the sizables. There were some secrets hidden in interesting ways using the gimmick, but other than that it felt very awkward to play through and not very visually appealing as well.
I understand you tried to make it clear where the enemies and the player are by recoloring them, but the recolors felt random and not very good looking for the most part. Plus, you might have went with different decorations there - silhouette levels need more varied aesthetics to make it not look boring, and the generic hills don't look very interesting when they're completely black, and obscure a lot of the solid ground (such as the slopes for the most part). I also felt the white sticked out a bit too much when used on some of the objects, specially when it's used together with black. Not sure on what you could replace it with, though.
Might also say that, ignoring the aesthetics, the level feels boring and generic - there aren't any interesting gimmicks gameplay-wise, and the only enemies used are the Koopas, Goombas and Piranha Plants (which are seen as more "global" enemies). Some work to make it stand out more on the design part would be appreciated, as there's not much unique to it other than the aesthetics, and even that could be done better.
(not an official review of course, but might as well throw in my opinion)