I'm going to give my opinions on the levels already displayed. These are honest criticisms, and as such I won't be holding back, so don't get too upset if you don't like what I have to say.
"Tight Fit" - There are two ways I'd describe the beginning challenge, which forces the player to be light with their jumps as they simultaneously avoid spikes and blocks that alternately flash gold... "frustrating" and "well-designed". It's a shame that the other two challenges (including not touching the flashing arrow... I fell for that the first time) aren't nearly as difficult or thought-out. It still turns out to be a respectable map, and with a tighter focus the next should be much better.
"Use the stairs" - This one I didn't really like. There's no challenge involved... NONE. Beyond that, it's not very hard to figure out what to do in it. That said, I can't argue with the concept of the moving platforms hidden amongst the normal blocks... If that was attached to something with a legitimate challenge, it could be fun. And the only time I died was when I intentionally ignored the GO BACK warning... Got to appreciate the LOL thrown in there.
"DUMBASS MAP DURKA DUR" - Could've been called Use the stairs 2 (would've been a nicer name, too). Has a lot in common, only this time the messages work in reverse, as following the arrows will lead you to your death. That, and I actually died a couple of times because of something other than the deathtrap you're led into... Moving platforms have squished me good. Either way, this one is actually more interesting than Use the stairs, but there's no real use in intentionally misleading players to their doom. They'll just see through it eventually, groan, and figure out how to really beat the level. It's not fun for the player, and it does nothing for a level.
"New Level" - The last name was actually better. This map, however, is MUCH better. It's my second-favorite of the ones introduced here, and it'd fare better if it didn't suffer from a nasty glitch. The second fan at the bottom pushes you towards the blocks, and you get stuck pushing into one of them... leading to a mid-air walking animation, and the eventual death of your character as a block turns to gold. I've only managed to not get hooked on it in one playthrough... in the other three I've had, it gets me stuck everytime. It's a shame, because this level is otherwise very well-designed. The buzzsaws at the beginning look menacing, especially when combined with the gold-flashing blocks and the fans, but a couple plays will reveal that they're easily enough traversed, and the rest isn't nearly as difficult. An easy level, but a very solid one that's only marred by one glitch.
"Shimmerspike" - This is my third-favorite, and the only one out of all of these that's consistently hard from beginning to end. It's this difficulty that both makes it good and puts it behind the other two choices. Even still, this is how the levels SHOULD be made - after beating Tower Of Heaven I'm sure the players are looking for more levels that offer a stiff but fair challenge, and this level heeds the call.