Wow, this game is stunning! I loved the graphics, the style you used, the consistency of the arts, and also the soundtrack fits so well!
My two cents: although the mechanics of having a second reality is not new, I think you implemented it in the right way. Some games go for "what you always see is not real, but you can briefly see what's real", resulting in a moltitude of fake platforms and hidden holes, which could lead to a frustrating game experience.
In your game, however, I appreciated the fact that everything I was seeing was really there (I could trust the world around me!), and in addition there were invisible platforms which could help my path. In a nutshell, I felt like the game was not trying to deceive me. Thank you for that :)