This is very cute, I enjoyed making salami and strawberry salad for my fellow invaders!
My main feedback would be... well, player feedback itself. When I feed an ingredient or food to someone, it would often just disappear, they have no reaction, and they keep waiting.
When they actually don't like it, it's great, and when they like it, they leave (although I would've liked a "Thank you" or something :P). The problem is when the food just disappears and they do nothing. Is it that they want a prepared food and not just an ingredient? Wrong flavour? It's not clear what I did wrong. Try to have some form of feedback for every possible interaction. Otherwise, great!