It's boring.
(sorry for the lame joke...)
All jokes aside, this is a pretty swell album. That's the thing that I love about drone music: it's ability to effortlessly set a mood
when done right. You've succeeded in doing that; I can imagine several movie scenes that would benefit from having a soundtrack like this. You obviously have a pretty good understanding of how to make music (considering the dynamics of each piece, the way that you convey space), so I don't really have any constructive criticism to provide. This is a genre, and criticizing certain aspects would change the genre in my opinion. So yeah...one question. What tools do you use?