Short but very tender. It made me think and force myself to see alternate realities, especially the "tricky" room with the three snakes, where one perspective swap too many led to immediate failure. The music is meditatively ambient. The very last puzzle was more challenging than any two others combined, and its moral was eloquent enough that I could easily have enjoyed even more levels after that. But then came the ending -- a bit bittersweet, but still touching. Nice game!