Nice competition!
I'll make (short reviews) of the tracks:
Before the World Ends - I loved the natural sounding intro with the flute and guitar. I didn't know the source, but after listening to it, I felt it was nicely used.
Only thing I disliked were the drums. Very unfitting samples IMO, especially the snare which is just bad. I expected a more natural sounding snare. Also, the synth starting at 1:45 could use some filtering since it feels too "static".
Broken Wings - Good song, very dramatic. I wasn't that happy with the source usage since the original song has many sections and you elaborated on very little of it. Still, the section that you picked was nicely developed.
Production is very good (for my standards). A deserved winner.
Scarf Face - Fun song. The rock approach was cool, and fitting for the source.
Production wasn't that good in my opinion though, especially regarding the volumes. Drums are very important on rock songs, and they are very low here, making the arrangement feel a lot less powerful. Guitars were very cool though. Synths are a bit dry.
Upon New Shores - Source makes my nostalgia meter rise! I liked the different rhytm for the intro section, but I felt that the introduction of the drums was a bit too sudden, drowning the synth. Actually, drums are a bit too loud for most of the mix imo.
Arrangement is interesting, the electric guitar usage reminds me of Chrono Cross! Source is nicely used on the song.
Vertigo - Being very honest, I didn't listen to this one carefully. It's looong and I'm not a big fan of techno/electronic music... Also the link provided for the source wasn't very good. I'm not too familiar with this kind of music, so I can't really offer much advice.
The synth at 4:55 felt a little weak though. Most other stuff sounded nice.
Yo Momma - Nice source! And nicely arranged too.
At times I feel the song sounds a bit muddy, maybe because the synths are too similar. Maybe you could have used more varied samples for this.
I'm a novice, but I hope this helps!