Over 50 bits of cheese, and no effect. Snaky, my dude, this just isn't working... clearly they just think you're trying to be friendly. You just gotta be honest with your feelings. I know it's hard. But it's the only way.
Anyway, it would be cool if the game was a million times more complex with more characters and story and gameplay and whatnot. But it was still plenty of fun.
Here's one specific idea though: it would be super cool if rats acknowledged each others' presence more often. Once or twice I had two rats say something in quick succession, and the second line sounded like a direct response to the first, and it was super cool. How extra cool would it be if that kind of stuff happened ON PURPOSE? It could be kind of structured but still heavily randomized. INFINITE COMPLEXITY. INFINITE IMMERSION.