Clean ui, nice and minimalist game.
I think the main issue for me is that there was no punishment for moving a piece without actually matching anything. So you could just move the golden pieces into place if you wanted to finish the level.
I think it would have felt better if the shapes automatically deleted when they formed a line of 3+ rather than sitting there until acted up on by the player (This would probably require adjusting the spawning/generation so it doesn't just give you a bunch of points immediately)
The rotating mechanic was pretty cool :)