Awesome concept and implementation. Love the art and the music/sfx fit amazingly well. I was able to catch one bug, if you just play level 1 each time the level selector pops up it will still unlock the next level. You can even do this after unlocking level 9 and it sends you back to the main menu similar to if you beat level 9. I did replay all the levels just to experience the different tools and tricks you had implemented, I see a lot of potential for an amazingly challenging puzzler here. well done.