3105 is a pretty big score! My best was 6882, and it took quite a while to complete; it felt pretty awesome to score so high. While I was bragging about my score Partheas crushed it and discovered the score counter didn't handle 5 digit numbers very well.
Yeah, a confirmation would have been a good idea, at least for things besides rocks. I think everyone I've shown the game has at least demolished 1 thing by accident, and it is really punishing.