Great duality concpet, very well exploited.
I loved the audio track and the game look very polished.
On the negative side, I had very anoying jumping issues (not being able to jump to the left up corner from a small plateform for some reasons) and it made the game very frustrating to play.
I am also very confused about the progression in both world. I mean i seem to do alright since my player seem to move on but I don't feel I am in control. I feel my character that was left somewhere and stuck is now in a completly new location and since both world look very different it doesnt seem to be mirroring movement.
So yeah it got me a bit confused.
Appart from that, good job, great ui, soundtrack and duality mechanics