Allright i tryd the levels and i gotta say theyr awesome! but!
The first level was like "come on" x) kinda jump i dont like very much!
Second level was a bit wierd too but i figured it out ;D btw some tiles where in the backround at the very beginning, i hit the spikes on the other side alot

lvl03, awesome! i dont usally like those.. things but this level was fun!
(Bit hard to see the key in the middle, i didnt spot it at once)
lvl04, awesome as well ;D
lvl05, now those things started to bug me x3 i didnt really finish it because the wall all the way to the right with spikes on the right side was killing me when i touched the left side

lvl06, awesome but tricky xP
lvl07, how should i explain... awesome!

And i love your visual style!
sorry my english -.-