I just completed the demo and wanted to tell the developers what an amazing game ABRISS is. It was unique, creative, and beautiful. The sounds helped to create a feeling of immenseness - that these were actually gigantic structures you were destroying. Reminiscent of Throw Cubes into Brick Towers To Collapse Them and Besiege, ABRISS was dark, destructive, and challenging.
You all already addressed my chief concerns about the game - where the next piece snaps onto, like user DARTEKZ stated, and reverting a single placement, as XacUop10 stated.
Excellent game, and I'm looking forward to the full release. Thanks for creating a playable demo!