I really loved this! The music and the clockwork movements got me into a flowly meditative state, and the presentation is great. Some minimal shapes, a good color palette, and well-considered animations. Lovely!
Only tiny feedback is it'd be nice if I could use my arrow keys instead of clicking, that way I could really keep my focus on the action area and the timeline instead of being sure I'm clicking the small targets when I want to switch modes.
Also, truly, the music is exceptional! I'd buy a small album of ambient tracks like this. :)