Very cool! Inspiring actually.. Makes me want to do something chill like this.
It takes a lot of control, to hold back from making melodies more complicated -- for me anyway.

And not layering too much stuff, and keeping things, well, chill. Nice work on that.
About the flute sound -- I like the initial one at 2:30ish, but when the higher pitch comes in at 3:00 -- that seems to me like it'd be better as a whole nother synth sound, or maybe it does just need some EQ. Not sure.
The sub in the last section was just too subby for me. I thought a truck was driving by, and it didn't do anything musically for me. I like the idea though -- it could be fixed for sure.
Great job!