Interesting idea
Definitely an interesting idea. Instead of making a whole lot of installments, though, I would have just made them into one huge one so that the player could have 30 levels of exploding madness in one sitting. I think it would score higher.
Anyway, my other suggesting is that you should definitely add more things like the money level, where you have to figure out a clue before you're able to get the item. It adds to the interactivity, and makes it possible for someone to lose (only a snail could lose as it is).
Oh, and I was also going to say keep working on improving the animation style. It's fine, but if the lines looked crisper and the objects were not all freehand style, it might draw a bit higher score.