When you click and drag, are you sure you have any scales left? Check the top right corner to see how many scales you have left/
I see, I didn't notice that limit at all and the tutorial text was still saying to click and drag, so it just seemed like something wasn't working. I think having the tutorial text mention the limit as well as having some instant feedback to dragging, like selection box that updates while you're dragging and highlights the tiles that would be affected, would go a long way. With that aside, the game is actually very good. I didn't get all the way through it yet but I got through a bunch of the puzzles. A lot of cool emergent properties that come from the core mechanic and I had some fun realizations about how to solve some of the puzzles. Good job, just the one complaint I have is that UI issue, but it's a much smaller issue now that I understand it. I've updated my rating with this in mind.