Heh, too simple & obvious, but... The low-fi graphics just give it SUCH a creepycool mood. Not only from nostalgia, but objectively. There's just something about the reduced colors & jagged edges that make everything feel sharp & dangerous. Obviously not something that modern graphics can truly emulate, no matter how lovingly rendered & thin-tipped they make sword tips, fangs, claws, & spikes. It's about the whole creature/enemy looking sharp. & the starker contrast of the colors make it seem like they're cutting through the darkness itself. 😈