I am Setsuna has some weak dungeon designs, feeling a bit more straightforward than I would like, and I'll certainly ding it for reusing assets. When you get down to it, there are only maybe four or five different environments tops in the game, and I really feel like the developers could have added a bit more pizazz to the dungeons. It's only more daunting because towns actually have a bit more variety, so it's a bit weird that the dungeons all borrow from the five same visual styles. There are also little to no puzzles in most of them except the Ancient Towers, which themselves are way cooler looking on the outside than their interior.

Also what is with the game's bizarre difficulty jump? I know I'm towards the end, but bosses pretty much went from being a handful to being outright nightmares. I appreciate it a bit since so many games are easy but part of the issue here is that regular encounters are still ridiculously easy when you're not running into one of the Spiritnite Infested Monsters which are all practically optional superbosses in their own right. None of this is helped by the fact that it seems like the majority of players who have beaten the game online seemed to all have just grind at certain points to ridiculous levels, so many of them can't actually offer much in terms of strategy beyond "go to this place, fight this mon for six straight hours, beat game."