This is a charming little VN you have here, heheh~ In particular, the atmosphere and sound design were quite well done, as was the UI. I personally would've liked to see some more world-building, to have spent a little more time with X and Y to learn more about them and about whatever calamity it was that ruined their home... but then again, as per the description, this VN was made in 4 days, heh. Considering the tight deadline, I'd say the end result came out quite nicely indeed!