Wandering Roots : 0:28 there is something weird going on between the synths and guitar arps, don't think its intentional , need to look that up melodically and fix what is happening to fit the chord transition. I like the "meow" pluck synths. Nice buildup also when the real melodic synths starts is a nice touch. I would just change a couple of very basic and predictable chord at around 0:54.
The Gardener : Really like the chords and vibe, its well mixed there is multiple sections, I like the phaser effects also, this one is pretty well done, short but well done.
Symphonia: Very bassy but I like the simple tone, could probably tone down a little bit the bass just a smidge,
The System Maintenance: First thing to look, cut some frequency on the bell instruments can be easily annoying. Great sound design its very unique. I also really like the transition when the pulse bass starts. Snare is definitely too loud and I think there is room but percussions build up here and go very dark, distorted
Pat's Song: Sounds good I like the simple vibe, this one is the more neutral track of the bunch in my opinion, but it still feels like its part of the whole soundtrack
Mixing wise all the tracks are well produced, arrangement has some nice ideas, just missing a couple of stuff here and there to embellish and make everything more kick ass. Well done.