Voting as I go through them.
Yami - Pretty good, but it didn't really hold my interest. In fact, my attention didn't pick up until...
Tuberz McGee - 0:33 in this song. Great work Tuberz. Nice usage of SANIC VOCAL CLIPZ.
Mr. L - Pretty chill track here; I would've liked to see who you were goin' up against's track. Likin' it all the same though ^.^
jnWake - Ooh, very chill. Nice tempo goin' here, really nice. Not much mix-up though; it's nice but the lack of variety aside from that one solo is a bit of a let-down. Feels a bit drawn out, to be honest.
therex - High-energy from the get-go. Speedy and entertaining, fitting for the song from the Sonic side. Your solo is also very high-energy. Very enjoyable track. Ends right when it should. Also lovin' the name, for what should be obvious reasons
Cash and Change - The title makes me think of Marble Madness, just sayin'. Rather abrupt transition between the sources, but it works in its own way. Ends abruptly as well. :/
MindWanderer - Midi-sounding guitars kick in not too long after the end and continue throughout the track. I don't know why, but for some reason I got a slight Crash vibe at around the 1:40 mark. Not much goin' on though. Like jnWake's track, it feels a bit drawn-out, longer than it should be.
Cosmic Sounds - Rather slow and dramatic, this one. Fitting given the name, I suppose. Very deliberate pacing, though. Sounds like the soundtrack to an old movie, to be honest. Tough call here.