I know it's a demo, but it seems it ends with both the "yes" and "no" responses making Linda cry and the game just stops.

The real question of course is why is it "angry?"

Hey XenoCow, thanks for playing it. After you're finished talking to Minda and you click the door behind her to leave the house, the demo is over. I wasn't sure if I wanted to add to it and make it a full game yet, so if you like this kind of thing let me know. 

That's entirely up to you. I do like weird and surreal stuff like this, though.