huh, i thought i fixed that one already, he normally re-appears after a few rooms
the back door used to turn the switch off without resetting the number to rechase
the incorrect live2d thing is usually a result of it being called before the live2d is fully loaded, if it happens on loading a save then hitting f5 to go back to the menu usually makes it work the 2nd time (as long as the game isnt closed)
as for the minotaur i cant see any reason why it would lag unless it spots you but i'll look into it