I really like how everything feels. pulling apart the rocks makes me feel like they have weight to them and that's awesome. I would love a visual line to show where the unused area like you showed in one of the levels but that's just a small nitpicky thing. The puzzles are also great because I learn a lot about how the rocks connect to different things. Lastly, I must comment that the pin is such a lifesaver. Before the introduction of the pin in the earlier levels I was dragging my mouse with great force to pull apart the rocks so thank you for preserving my sanity. :D
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Thanks! I'm also very happy with the physical properties of the rocks and so.
About the visual line: good point. a simple marking would have helped already i guess..
About the pin: it's easy to miss, especially if you skip levels. Maybe there should be a one-time pop-up/ingame message around the pin if you haven't used it in a while.