This one actually ran kind of slow too, which is unusual for visual novels, but they are using Unity engine instead of Ren'py, which is what most people use. But renpy is basically a slideshow thinger and doesn't have many features, so maybe this game will have better features throughout if it's using a better engine.

Visual Novels are kind of hard to give demos for, though. In a bookstore I can flip through a book pretty quickly and make a decent judgement about it's quality. You can't really "flip through" a visual novel.

I can spam the left mouse button for a bit though and this one seemed decent. Wishlisted.