absolutely delightful. I loved learning how to play this game. Aside from the wonder and exploration in this little poem, the music was one of my favorite parts--I couldn't tell, but did adding to the mountains have any effect on the music? sometimes it looked to me like the mountains resembled waveforms--I think that would be something very interesting to explore.
All in all, excellent job. I only wish I didn't have to refresh the page to play again and again!