Ahhh. Zooming does reveal that bug. Unfortunately, I think that the action of zooming to see behind something is not intuitive to the player. In my mind, the foreground would only become larger when I zoom in, so I would expect anything behind it to become obscured.
I don't think that hiding bugs behind objects is a bad idea, but revealing something behind an object when zooming IN just doesn't feel right.
Again! Well done. This could easily be a successful game with more levels and play testing!