I like the general idea, and the sound and visuals are pretty good!
Perhaps there needs to be something more in the end. I like the twist, but maybe it needed to be revealed more gradually (or be hinted at more from previous scenes (maybe I just missed some hints, but still)), and also perhaps have some final image/more text at the very end that explain better what happened (for the simple minded like me :P ). The twist idea in general is quite awesome though! Good job!