Wow.
I found the beginning extremely compelling, even though the art was not sophisticated. Almost entrancing. So I was a little surprised by the initial transition, but once it was under way I loved every second of it...
Great concept, great twists, great ending - although I would have liked to see more. I could have used more plot in there, within the dreamworld. I felt like we had only just seen the dreamworld when we were jolted back out of it, although perhaps that was the intention.
Aside from that, I liked the music but would have preferred a less "pixelated" sound. In other words I liked the composition but not the instrumentation. But that is mostly personal taste. 9 out of 10. Excellent.