Hi Alex,
I was drawn into this post because I tend to mess around with single chord stuff myself, or even a single drone note, with the "key" being set by the melody (usually a pentatonic minor scale).
I was then intrigued by your reference to Berlin School, being an avid TD fan in the past.
So, on the whole I think the experiment was a success, but it was only a 2:24 piece. To take it further I would add a few more elements perhaps... But still stick to the Cm chord.
cheers
andy