When I read your description it reminds me of the meps we used to do, it sounds like it was a really interesting project to make as a team and you all tried kinda hard, that's really cool. Now to be honest I didn't really like it as a whole, some parts stood out but most of them lacked important stuff in terms of editing and control of the effects used. But that's good, keep on trying new things
I'll more or less detail track per track
Track 1 (EF): Very nice, I especially liked the transition at 0:13. However the texts at the beginning felt too dull.
Track 2 (Zankyou): The masks are a bit weird but otherwise it's ok. You should pay more attention on edges.
Track 3: it's not bad but the scenes are a bit bland at the beginning, it needed a bit more variations than "oh I walk in the hall". Also the effects were a bit sketchy but nice effort and it becomes better afterwards
Track 4 (5cm per second): Good atmosphere and implementation of the Big Contest stuff, it was cool
But the scenes with the memories behind the mask were bad, the scenes were flowing too fast and the dezoom wasn't needed, it felt weird.
Track 5 (Sky smth): rather classical but works quite fine. Nothing special to say
Track 6 (Haruhi): It could have been the best part but you completely ruined it with these annoying cam moves. You need to understand how moves should flow, here everything felt shaky and not consistent at all.
Track 7 (Tamako): Nice but the twitch was showing a bit too much and these roll transitions were being inconsistent.
Track 8 (KnK): same comment but actually a bit better
Track 9 (Nagi) : I like the first scenes, they fit the song well. Further in the part I think you used too many fades and flashes, the picture seemed unclear.
Track 10 (Hyouka) : it looked like you tried a looot of stuff altogether but didn't really think about it. The pace was kinda cool but you really need to clean out and make everything more consistent. Also these lip flaps were painful.
Track 11 (Chu2byo): The best part hands down, clean and on point, good job!
Track 12: That was cool, especially the scenes before shigatsu. I didn't like how you used too many abstract scenes, it needed one character or two inbetween. The eye transition at the end is awful though, I don't know who to blame.
Track 13 (Shigatsu): That wasn't bad but the pace was weird, I liked the mask at 3:15 but that was obviously too slow, and then you rifled the scenes, make up your mind haha
Track 14 (Kami-sama no inai): I liked that, well done
Track 15: Very nice end, the scenes were all well chosen and dat final scene though. Well thought, good job
That's it guys, I hope it helps, good job and keep it up as a team