yeah, I guess alot of mechanics will change between now and a more standardized version. the torch still works, but instead of him holding a flashlight, it makes an illuminating circle around him in dark rooms.I think it's a bit early for a guide, Shiro no yakata is a demo/gallery showcase of some upcoming enemies/animations at this point.
Zell is updating month by month. The sex symbol for example is only about 2 months old, so not too surprising there aren't many interactions yet. I think the torch was scrapped not so long ago, so it has ongoing changes and bugs...