Touhou Luna Nights is a very intricate and tightly woven game where a good majority of the mechanics play extremely well into each other. This provides lots of self experimentation and realizations that keep the game fresh and rewarding, getting items is a reward in it of itself but working it with your other skills and own ability within the game is a feeling that no amount of "reward" systems within videos games can provide. Another good point I'll bring up here is that the story is quite self contained, allowing for non-Touhou fans to enjoy this game, this especially helps in recommending this game to friends.

TL;DR
Play as cool maid waifu who throws knives and stops time.