p.21 ねこじた means Kuro can't take food when it's too hot, in this case the soup. Not whatever you mean by "A cat's tastes".
Lit. "Cat's tongue", it's a common trait on cat-eared characters due to the pun. https://jisho.org/word/猫舌
I saw a yt vid on it once but havent really played it, does it play like uhh the sims? Or recettear? I dont think i have the right references or frame of mind around it