Now that's what I call a cool song!
The chord progression on the start is one of the best chord progressions I've heard. My favorite part is from 1:34 to 1:49. I just love the atmosphere there!
The only thing I have to complain about this song are the three descendanting chord at the start of the third chord progression.
The piano feels like an another song, this is just an idea, but I think you could remake it into a full song.
Live long and prosper!