Why yes, I did in fact make a zoo filled entirely with humans and kept them alive by only feeding them pizza. I am pro interdimensional zoo keeper.
I really liked this game! The graphics and sound effects were super cute, and the gameplay loop was quite cozy. I did notice some bugs as I populated my zoo entirely with humans, however. For some reason, all my humans would be renamed to the latest human I kidnapped befriended and all their wellness scores would become exactly the same. This wouldn't apply to the rare humans in my zoo though.
There was also a little "bump" in the ground as I started to walk right in the zoo. Speaking of which, having the option to warp back to the left of the screen is a very nice touch.
I remember playing your previous jam game with the bird, and can definitely see how much you improved! You've got a talent for these cute games. Good job!!!