Cool, chill game. The music goes well with the premise. Nice job setting a scene that shows a story.
The controls are a little tricky. I think part of it was that W and S still impact altitude while shift and space do as well. Part of it is the maybe less conventional layout with space and shift. The right click movement of the mouse also caused some problems, even in full screen, it got clunky. If I played it long enough, my brain would probably adjust. I think it was starting to.
I like the colors of the scenes with the sunsets and twilights, too.