Thanks for the feedback Mattie!
The first thing that came to mind with the theme and limitation was Osmos-style games, and I wanted to try something a little different.
As for the controls, I would have loved to have some mapping options available, but time didn't allow. Z and X are common buttons on some of my favorite old free downloadable games, so that was a blind spot for me. There are gamepad bindings but I didn't want to advertise that since I wasn't sure if that would work universally.
: ) This makes you the first stranger to ever play one of my games, that's exciting!