Quite a touchy subject.
I had the urge to close it throughout the whole movie but at the same time couldn't stop watching, I think that you did a great representation of a crazy person, or at least I did feel crazy while watching it. There is only one word to describe it, sadly it's french, 'psychadelic'.
I read the other reviews and your respond to one of them kind of urged me to respond. Hitler and Stalin weren't really monsters, and quite far from being psycho's. They both pursued a goal of doing good, they just didn't use the right means. None of them had bad intentions. Both were political genius and to say the least, every leaders of the major nations in the 30's-40's weren't any better than the next. I mean USA used the atomic bomb while well knowing the long term effects and Britain waited so long to act because they wanted to use Hitler against the communist threat.
A good book about the mind of Stalin and Hitler is 'They were seven men in war' by Marc Ferro.
Aside that, keep making more, enjoyed it.