Really well-done, casual coffee-break title. I'd like to see more aspects, such as maybe certain blocks that (or levels that cause all blocks) to stay rigid against gravity (if one side is suspended, for example) until the contacted one matches and snaps it off.

As a southpaw, I kinda wish that levels would alternate which corner the merge point would be (the instructions say "left" but "right" might be fun at times)!