Oh, that's how it works.
I managed to finish all 3 levels!
Regardless of the scatological theme the mechanics are actually quite good. Growing is fun and hints from where the food is coming from are quite useful. I really liked how each level changed a gameplay a bit so you need to use different tactics to get out of the pit.
I still feel the character could be a bit more agile, but all in all it's quite good.