Well, I ejoyed the roguelike part, but sadly it gets interrupted with so much dialogue that doesn't justify why you must wait so much for it.
I guess a better approach would be to set appart the vn game itself, with another background and music, that way the game won't bait you into thinking the gameplay is about to start when there's still a loooooong story to be told.
I liked the dialogue between Reimu and Cirno, but Aya seemed quite irrelevant for the story, since her mission is to kill everything and that was something you were doing from the start, so, that's it.
The best part were the enemies that attack from afar, really made me think on how to confront them, it could even be a good idea that some doors opened a second door and enemies trap you from behind or afar, that could be fun.
Game went just dark and the battle with remi never came, if the last rooms weren't that long I could replay it a couple of times just to see if the bug fixed itself.