This is neat. I really liked the feel of clicking and having the smooth curves of dominoes placed for me. But on the other hand that meant that there was basically no challenge. It would have been nice to have some additional mechanic or complexity in placing so that each level wasn't just clicking several places along a path and then done. It also felt like time moved too slowly during the simulation watching the dominoes fall was fun but I also wanted to move on to the next level more quickly.