Okay, compiled list of great things and vice versa:
-Maybe add another layer to the bottom of "My harp is made of two mews" by the entrance? It makes me think I can get down there.
-And what in the world is "My harp is made of two mews" supposed to mean?
-Also, a floor for "Space Invaders: Digital Prison". The screen itself seems to be just filler, I think it would be better off with thick walls...
...but that's just my take.
-I also had a slight problem with the writing on walls. While I wouldn't encourage it, you could still use roomtext, instead.
-"Just like Simon's Quest: Empty" also needs a floor
-I feel the checkpoint on "The effing oacksteak..." (?) should be further right. It is a bit burdensome to walk over every time I succumb to the dangers on sharp objects
-Unless it's just part of the challenge of getting the trinket
-That being said, the trinket by the entrance is kind of unnecessary, like the one on the first screen and such.
-"Hidlyde" needs a floor
-There's so many hallways cluttered with gravity lines!
-"Feeling safe?" has crossing gravity lines and an unnecessary one on the middle-right of the screen (Unnecessary as in it looks to rebound you from flipping off of the top, yet you bust your head open anyway because of its close proximity to the spikes below)
-"Why you all get lost? 3:<" Has a emoticon in the name and is not proper grammar, consider revising
-"The Playground" appears to serve no purpose, with all of the warp tokens leading nowhere
-The left side of the screen directly under the first screen is a deception which serves no purpose
-There's no checkpoint in there, either
-"Rescuing Princess Peach: 900th Time" lacks a visible floor

-The room names were unsatisfactory, honestly
Review: Missing floors, clutter, why'd you put an emoticon in the room name, some unnecessary trinkets here and there.
Yeah, your level could use a bit of work, in my opinion. But keep trying, something good could come out of this!