This is a really unique game. I agree that a little more guidance built in would be helpful. I don't know what I was doing wrong at first, probably not typing exactly " you! " with a space on either side, but it took me a while to beat the first level. That poor woman got an earful.
I think the main drawback is you can literally type anything, but you have to try to figure out what hard-coded words the person does and doesn't want to hear. I was throwing out words as fast as I could type so didn't really know how to interpret the score or the messages at the top, especially as sometimes they were stacked on top of each other. Since I was just throwing words into a text box and didn't really understand my feedback, it was hard to know exactly how I was doing. Usually I just tried to rip out the message as fast as I could (and probably typos are what let me pull it off).
However, I really like the style of the game. It's very simple, but the sort of hand-drawn papercraft look is really charming, even if there's only 2 backdrops and 4 NPCs. I managed to figure out the old lady's favorite words and get the "can i sit down" ending. But as I said, I struggled to interpret the text at the top so just kept typing random words and "can i sit down" until it worked, then I was able to go back and refine down to the 3 words.
All this being said, I think it's a really cool idea for a game (even if I didn't exactly see the parasite connection while playing) and look forward to seeing you in future jams!