Great idea! The minimalist art style and the peaceful music fit the game perfectly. It took me a while to get the hang of the mechanics but once I did, I had fun figuring out the puzzles and building the different objects.
One minor nitpick (in addition to the control issue that a lot of people have mentioned): the music stops and restarts very abruptly at the beginning and end of the tutorial level. Maybe fade-out/-in the volume there a little more gradually.