Fun project!
Very original idea and it works for the most part.
The drums are laid-back and frantic at the same time. The little ambienty samples and melodies fit in great.
However, I found the part where you sing several lines with only the drums as accompaniment too draggy. Your singing blended in with the first part, but you would have to sing with a bit more energy when you "go solo", in order to not lose the tension that you built up so minimalistically.
I'm now listening to Sleep Deprivation, so I know it wasn't a lucky shot - you have a great knack for this type of music.
4/5 for this and check out my stuff too