Hahahaha, I'm so glad you liked it! I actually initially thought of the whole game as a sort of zen food playground, but then decided to add a bit of structure with the puzzles, before letting people loose in the zen mode.
As of right now I can confirm that there are no hidden levels, but it was actually something I was thinking about, and I do have ideas for some in an updated version. But that's all I can say for now. . .