I agree with basically everything here. I found the 12-18 dungeon an extremely frustrating experience due to the difficulty spike. I imagine the full game will be much longer with a more gradual difficulty curve, but it should not be demanding such an extreme level of mastery from the get-go. Frankly, I think the first real boss (the haunter-looking guy) isn't reasonable for a first-time solo player to deal with, since he has multiple very fast, extremely wide-reaching attacks that hit multiple times and can potentially one-shot a player who hasn't invested significantly into vitality- which I don't think most players will, since not much in the game up until this point will hurt them that much. The first boss should be a check to see if the player understands the basics of the game, not a check to see if the player went and bought a dozen health potions to facetank the boss.