I am very hyped for this game, fighting the Griffin in the demo (although your characters are overleveled for it) is lots of fun. Also, as for the number of enemies, I heard in a stream that there is just under 100 different enemy types. So that is a good amount if they are all different types (I don't think they have palette-swapped skeletons and the like). Two monsters that were similar are the Griffin and the Cockatrice, having similar size, shape, and movement, however the Cockatrice was different enough with a chicken-like face, black coloring, and a gas attack that can make your characters covered in petrifying material that slows dwn their movements considerably. It spends a good amount of time charging in this attack with a big bubble in the neck where it gathers the gas, so maybe you could puncture that and cause it to damage itself.