I love it! You know, you have a way of setting out with a plan for an atmosphere of a song, and then executing this plan perfectly and coming up with a song greatly reminiscent of the atmosphere you had in mind at the beginning. This fits very well with the NAC theme and I wish you luck for it!
So, let's get started. Like I said, atmosphere-wise this is a winner. It's very clearly summer-like. So much so, in fact, that I think that summer would have come to my mind even if I hadn't seen the name and the fact that this is for the summer NAC. You've really nailed those sounds, man. Very warm and inviting. The composition is quite happy too, also fairly representative of a summer atmosphere.
Speaking of that, the composition is very nice. I felt that the main melody was repeated too much in a small period of time, but otherwise I like that melody. Quite catchy and it's easy for it to grow on you too. Lovely chords on the choir too. However, two aspects of the composition that I didn't like were the flow and structure. I think those are the weakest points of this otherwise awesome track.
Flow-wise, I felt that some parts were immensely anti-climatic. I'm taking about the really long drum fills/rolls/transitions/whatever you want to call them, for instance the one at 0:50. The crashes came in early making me expect a much more climatic/busy part, or at least a part with an obvious new element or two introduced, but instead you just kept on going with the same melody (with a little change at the end of it) and same sounds.
Another anti-climatic part is 2:03. After that break I expected a lot more than a slow ambient part, and it made me question why you put that break there in the first place, even though it is very well executed.
In terms of structure, I know I had problems with your song structures before and I'm having them again I'm afraid :P. Your structure is very predictable and obvious. Starts off with an intro, then introduces Section A, Section B, small break, Section A, Section B, small break, and then the outro. I find that a structure like this will work really well for some sort of game music (in fact I can easily see this in a game) but for a song to listen to I'm afraid it doesn't work out as well.
What would work a lot better IMO is something like Intro - Section A - Section B - Section C (a section with a new dynamic introduced) - (the outro you have now minus the ending note) - Section A - Ending. The reason I don't like the outro how it is right now is that I assume you made that slower part for the end to reflect what you said about the memories of summer experiences, and I think a better idea is ending on a happier note, as if you're enjoying summer experiences, you stop to reflect on past experiences, then continue enjoying summer, rather than just ending on a sadder more reflective tone. Or something like that. D:
Now, other than the structure/flow, the composition is awesome. Next up, the mixing, and I've got to say that I'm impressed. You're improving in your mixing, I swear. This song is so clear. Everything that's supposed to be in the background is fitting cosily in the background and providing a wonderful amount of depth without cluttering up the mix. The drums are nice and punchy, and while I do feel that the snare is a bit harsh, the drums are clear and make a statement and at the same time they're not distracting.
Well, I wanted to say a lot more about this track but it seems like I've reached the character limit :(. I remember just about fitting the character limit with my old reviews before, but now I have so much to say about songs that the limit just isn't enough. Oh well! Overall, great work on this song. Nice drums, good transitions, fantastic mixing and great melodies and atmosphere. Just work on that structure/flow of yours, and see if you can fix those anti-climatic parts.
Also, I feel like an ass asking you for another review after you've reviewed me so much but do you mind telling me what you think about my medley? I worked on it like crazy :P.