Took about an hour playing through this with a friend, and we finally managed to work out all 19 stages. Early on, I thought [Balloon, 13, 17, 3x scale] would live in my nightmares forever. Little did I know what was coming... (level 16)
Seriously, this was an absolute brain melter at times, and that made finally working out the solution (or even just the values) soooo satisfying. Stuff like the leaf and the ghost scale were used for super creative twists in their levels too! Really clicked with this puzzle game and had a blast! Good stuff you've got here! :)