Hm, things look pretty straightforward. ...is what I want to say until I get to the part with the cow and the moons. We need more absurdities like that one. You can't let yourself be held back by common sense in Gensokyo! Not much else to work off of here, it depends on how you plan to let the minigames build on top of each other in another layer of complexity, but I think I'm getting ahead of myself.