Personally, I don't like long dialogues between the characters... but I guess this is just about personal preferences.
I've read the "Don't press 'W'" warning too late... I thought it was part of the game and it took me a bit to realize that something was going on: I was sincerely convinced that I was somehow guessing the right moment to jump between some kind of a multi-dimensional world...
(know that I've written this, I feel something stupid) :D
I loved the animation of the characters face.
As stated by others, there's something on the platforming dynamics that may need some fine-tuning.
But overall definitely well done! :)