Could've been so much better
At first I thought that some dude just heard the song and thought "oh kewlz I likes teh dis songz. I'll turnz it intoz a video", like so many other flashes involving the song and nearly none of KH.
When the title screen came up I changed my mind. Sora was drawn nicely and was welcomed with the KH ending theme. But my original train of thought reversed and crashed. Most of the segments were very off topic and was both annoying and felt out of place. The only decent bits were Evil Ludy's Kairi and DC5_bOi's recycled Cloud. The rest were a dissapointment and a bore.
I know getting that many people who know KH is hard to get, but have you ever thought of using less people and get the ones who will make KH related segments do more?
I hope you do this project again and only use KH related segments. Or you could wait for the KH2 theme "Passion" to come out and do it on that.