Okay first I have a question:
When did you do all this tracks and videos?
And now the thigns i have to say about your tracks:
1. First some are pitched a little high for my taste, but yes; thats my subjective opinion.
2. Try to increase the sound-quality of your tracks some of them are really scratchy and some seem not to be normalized so that they are more quiet or loder than other ones, try to have them all at the same volume.
(the volume at "Miracle" by Cascada is okay, still a bit scratch, but its okay and your other songs are too quiet)
(upload at 320kbps and 48kHz)
3. The personal words in the description are nice ^^ there i have nothing to complain about, but i think it would be better to write also in the description which song you excatly used for the speed-edit
like: Artist - Title (eventually Remix/Mix/Edit)
4. your tracks are not similar with our definition of Nightcore (except "Miracle" by "Cascada" (I dont accept them as Nightcore))http://nightcoreuniverse.net/viewtopic.php?f=17&t=930
(The definition of Nightcore)
I hope that was helpful. ^^