The stacking-stones concept is really nice!
I think the gameplay would feel smoother if there were a bit more space to work with, or perhaps if the stones could be temporarily placed in a UI panel and dragged out only when the player is ready to stack them. That way, it wouldn’t interfere with the stacking process.
I also really love the hand-drawn art style—it gives the game a unique and charming look that makes it stand out. Great work!