Very nice little puzzle game. The rules were very simple to follow, but with good depth; essential ingredients for a great puzzle. I think your design is already good enough that the tutorial can be dramatically shortened - my eyes went wide open when I saw the tutorial could potentially require 150 actions; but it really just needed one cake delivery to teach the player what they need to know. One small nitpick that I have is, apparently the image on the truck can be different sizes. When I first opened the game I thought those were the "normal" vs "bigger" sizes, until I saw the layered cakes. 
Great stuff, keep working on it!