Drew this is... potent. It definitely effectively mirrors the feeling of having a pet rock. I love the tone of the words you use in this game for the UI, "feed" and "play" are great because of the quotes around them.
My biggest critique: I would prefer if the UI were more consistent between the buttons and the cycled through strings that appear when you press the buttons. But this may have been purposeful! Like the fuzziness of the button text may have been to sort of have this very specific sarcastic feeling, so idk. Anyway I still think a little more consistency would feel better, like all of the text having the same outline or being the same size. Another thing I would like is if there were more string to be cycled through so it would feel a bit more fleshed out.