The song is excellent. You have a great blend of all these different elements and they oddly fit really well together. I think, however, that techno is not the right genre for this song. Seems to me more like Drum n' Bass. Like the use of the atmospheres and I liked the chord change towards the middle of the song.
The only thing I didn't like was the rain drops. For some reason, they didn't seem to fit well. Maybe the sample ended abruptly or something, it just didn't sound right. You might be able to use the cross fade tol to cross fade the samples or even just fat it out so it doesn't sound odd.
Other than that, no complaints, nice job!
Thanks! You're probably right that Techno isn't the right genre for this, but I'm thinking that Drum N' Bass isn't quite right either, but I don't know. As to the drops I know what you mean, but I'm not sure that I'll post an updated version on NG, though.
And to clarify this in general, I use no samples, although the atmosphere textures and raindrops are preset on my computer