Though I'm not any part of the Zymotic team I'd figure I could give my 2 cents.
I'll start off in the order I listened to them. It's Fried Mushrooms, Cammel and then Prevailing.
Fried Mushrooms:
The thing I loved most about this one is the drums, man they sound great, really love them. However the ambience sound off and doesn't really fit this tune. Also this tune sounds a lot like chip music because of one of the ambient noises, it's the instrument that creates the melody actually. For a game of todays standard (especially Zymotic which I base off from Nexuiz) this kind of thing doesn't suit it.
Summary: Overall a good song. Really great drums and the melodic beat. However this tune uses too much ambient noise and sounds like a chip tune. Melody is fine, but the choice of instrument could be different IMO.
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Cammel:
By far the best tune of those three. I love the feel it gives, it could really make it in a game if tweaked a little. This one also uses a little ambient noise but not as much as Fried Mushroom, in this case it kind of destroys the mood the song creates (for me at least). I just love the beginning and just after it passed the middle. Great melody and choice of instruments. It actually sounds like some kind of Wolfenstein tune. It's a bit dark, kind of like post-chaos type thing. Like you're left alone after some disaster took place and you're trying to find out what happened.
Summary: Great tune, my fav of those three. I love the feel it gives you. The ambient sound that start at 0.24 seconds is a bit out of place. It, in my case, ruins the mood. The melody that starts again at 0.52 brings it back to an awesome feel. So it's overall that ambient sound that I don't like, it could be replaced with something else.
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Prevailing Life:
Well, I don't really know what to say about this one but two things. The first is that IMO it uses to loud and some high pitched tones. This is a little irritating to listen to for a longer period of time. The ears get tired quickly. The second thing is that seems like too many things happen at once, so instead of enhancing the quality of the song it takes it away.
Summary: That's actually all that I can say about this for now. I kind of seem to zone out when listening to this song and I thus cannot comment more than this. I basically don't know if it is a good or a bad song. I only know that some tones, for me, seem to high and the result is that this song becomes an 'average' tune, without any preferences for it.
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So, I don't know what you'll do with my comments, but at least you got some
To sum up generally is that you seem to use too much ambient noise to fill out your tunes. Even Prevailing Life had some ambient noise. If you like those kind of things then great, but if you want it to sound more like 'normal' music (if you excuse the term) this ambient noise must be tweaked, used in a certain manner or taken away completely.
They are good tunes for sure, keep improving ^_^