Well this was a delight! Love the puzzle and riddle-solving aspects to it rather than the focus being on battling enemies (and love the fact that enemy interaction is batting them away with a cleaning utensil, very fun!).
It's a wonderful story, told in a very efficient way to squeeze it into a short experience (with multiple endings, no less!). All of the characters were really well-written and fun to interact with, the endings that I discovered were all awesome (and all emotionally-charged for totally different reasons) and I thoroughly enjoyed every step I took as Yuki =)