The only thing we really know is that the Cretans were dominating the Aegean sea and that at least the Cycladic cultures payed tribute to them, and probably some Mycenean kingdoms too, but that power had probably waned in the Neopalatial period. Their culture is pretty much a mystery. We know Linear A is not Greek, and might not even be Indo- European, so cracking their texts won't happen anytime soon. Bulls seem to have had some form of importance, and there are guesses about some kind of important priestess. Some think it might have been matrilinear culture, but we don't really know.