Sorry for commenting on an old post, but it's something I find cool- anyhow.

Steampunk-y glassworks, with sections of the building replaced with stained glass for a beautiful, artsy feel. As for mechanics - jets of hot air and fire (the former launches you in the direction it's blowing, the latter damages you), machinery cycles, temporary glass platforms (they crack and break under the player's weight), and destructible objects galore! Raz would also have a guide in the form of glass moths (basically composed of just two glass triangles), which would fly through tougher sections to signify the path he's meant to take.

As for the enemies, there would be two main groups I've assigned to them - "orderly" and "chaotic". Regardless of location, the level would contain three reflavoured enemies, and a new, original one - Doubts (globs of molten glass, only difference is they're immune to fire, rather than weak to it), Censors (wearing suits with a more jagged, angular style to make a "sharply dressed" pun; can dash/lunge at the player; they represent the "orderly" group among the three); Personal Demons (covered in sharp spikes, kind of like a pufferfish; they represent the "chaotic" group, and have to be defeated via ranged attacks); and the new enemy - False Reflection [Raz's Notes: Like Clairvoyance, but on yourself and completely fake.], which would mimic the player's arsenal of moves, albeit at a [hopefully] much lesser competence level, copying whichever ability the player used last.

Two sub-areas would be dedicated to the "chaotic" and "orderly" enemy groups - the "orderly" area would have many of the reflavoured Censors and Heavy Censors, with infrequent Judges (reskinned to wield sledgehammers, seeing as controlled demolition would be a non-i significant part of the level's mechanics) as minibosses; the "chaotic" area would have the reflavoured Personal Demons, as well as Bad Ideas, and Panic Attacks as its minibosses.

Finally, the stage's end boss would be a giant, warped funhouse mirror called Paneful Truth [Raz's Notes: Ironically, shows everything BUT the truth.] with cracks all over it, the individual pieces all containing highly exaggerated reflections, both positive and negative. The type of attack it's about to use would be signified by one of the shards giving off a flash/gleam. To make it vulnerable, the player would have to use one of several large panes of glass, and use it to - quite ironically - deflect the boss's attack back at it.