Spent probably 4hrs near the end just backtracking and cleaning up collectibles. I really wish you had more means of travel unlocked later, since the Train/Mirror don't put you remotely near anything worth a damn, and the pipe shortcuts are hard to remember with this game's lack of decent map, and with how dense every screen in the game is.
I kinda rushed the whole Astral Orrery area as far as NPC dialog went. Was it explained anywhere how it came to be? Or is it just a case of "Spark magics lol"? First time I saw it in the telescope early on in the game, I figure it'd be the end-game area, but nah. Sure would have sucked to pursue it earlier though with lower level att/def