I liked this song, especially the first minute or so. The melody you start off with and then the slight variation is very pleasant and enjoyable. After the first minute thought, I felt like things kind of lacked direction/structure.
The part that starts at about 1:00 works fine as a sort of "bridge", but after that I kept yearning for something resembling the opening melody to come back and it never did. Left me kind of bummed.
Overall it's still a nice, relaxing song. Definitely good for 2 1/2 hours of work. Nice job!