I've got two issue, the first one is the
white lines described by @Denhomer and in my
previous post (message n°4)
the second one is a sorting issue, to explain it, the boss door was at the bottom of the level, then when completing the room, the cowboy appears behind the barriers when the camera was showing the door opening (it was like he was in the weed field)
Also the pixel transition is strange, I think it suit well the transition between fights in the first final fantasy, but here it doesn't make a lot of sense. I'd rather take a screenshot of the current room, then use that as a sliding transition to introduce the new room.