I've played a bunch of boulderdashy sand physics games (and often bounce off them) but this one had more than a few pleasant surprises. Really well done. I was not bored.
( Also, I'd love to feature this in the puzzlescript gallery . The goal of the gallery is to let people both enjoy games, and look at the source code if they want to see how the sausage was made. If you'd like to be featured, either include a source code link on this page and ping me, or you can also create a shareable link via puzzlescript.net and let me know it).