Umineko does not have gameplay mechanics; it's not interactive at all. It's a good story, and provides plenty of opportunity for the reader to try to figure out what's going on.

But I would not call Umineko a shining example of ideal epistemology: e.g. the protagonist is investigating a murder mystery; but if in the process he comes to believe in magic, then he loses; and he knows that, so he'll try to avoid a conclusion that involves magic whether or not it's true; and all this occurs in a universe where magic does exist elsewhere, the only question being what happened in this particular mystery.

The "red truths" are a case of filtered evidence: They are statements guaranteed to be literally true (guaranteed both to characters and across the fourth wall), but they are also selected by the villain in order to be optimally misleading.