Interesting game, I just think there are a few problems with the dialogue system. I kept finding myself having to wait through dialogue that I had already read before because I clicked an option that I didn't realize was going to return me to a previous path. Might be a good idea to let players skip certain dialogue lines, or if going through a dialogue option for a second time, shorten it the second time around.
Also, I know you state that it is not a comedy game, but with such serious subject matter, it still comes off as comedy. The writing is a bit awkward and seems like you tried to make Hitler seem stupid or childish in a way. I think you would have done better to fully commit to a more comedic tone, because the situation is a bit absurd anyway, and the fact it's trying to take itself too seriously makes it awkward and ironic in a way.
Anyway, liked the psychology insights and learned a few thing about Hitler's life that I didn't know. The visuals were cool but I think they hindered the performance of the game when playing in the browser, and could have been simplified a bit since the gameplay only took place in the text box. Interesting project overall.