Cool! I like how all of the tracks are based on one melody, that just gets played in different contexts.
I also really like your piano work - super smooth and serene. Very nice!
One thing i have to say is that this reversed ticking you used is mixed in a very weird way, and is kind of annoying. Doubling it and panning them to left and right could help make them not feel to in your face, and also lowering the volume a little too, obviously.
Overall - pretty good!