I love the Magical Girl genre so I'm going to seriously give my opinion on this one!
First of all, the song is cute and it does have a nice 'magical' type of feel to it but I think something faster could have been really nice since this seems really typical for a Magical Girl MEP with the 'OMG SO CUTE' type of feeling it gives off.
On to the tracks!
Sailor Moon: The additive dissolve/brightness transition was a bit odd at times but it was a really nice intro for the MEP!
Tutu: It was nice, a little bit slow a times but it was cute! :3
Nanoha: I LOVE Nanoha, so I feel like I'm a little more critical of this track. The faster scenes from 1:10 - 1:20 just don't fit to me, I liked the first bit, it was cute and slow, but for that second part there are much better scenes in the movie alone that could have been used.
Pretear: This was pretty nice and it really matched with the pace of the music. This was my favourite track.
CCS: My favourite anime, so again I might be a bit more critical. ^^; More than one episode should have been used here. Also, just one sequence of the show was used and that bugged me a little. CCS has so many moments and for me, this was the perfect track to highlight the cuteness that CCS has to offer! /Sits in a bubbles of disappointment.
Madoka: You didn't use Sayaka.
This was a nice track, I don't have much to say about it really!
Shugo Chara: I liked the transition used between the Madoka track and this one! Really cute! The music really matched this anime!
Overall, it was a really cute MEP and the mood is there and I did enjoy watching it and I think you did a really good job for your first MEP! :3 Good job everyone!