I really like your roof effect, that looks pretty good. I also like what you did for the structures of the houses. Although it looks a bit bland when it stretches over a bunch of emptiness like in the center left house. Maybe you could add some extra texture to it of some sort. I don't have this problem with any of the other houses though, save for the bottom half of the house on the far left. Not sure what's going on with the boulder on the center left house, but I'll bet it's there for a reason. The network of upper platforms also looks pretty good.
Two problems that jump out at me are that the level looks a bit flat in a specific area close to the top left corner of the open space where it looks kinda flat, and on the right side of that ditch with water it looks a bit flat there. If there aren't the necessary tiles in the tileset to make these areas more visually appealing, then it's usually worth it to make your own.