Watched Made In Abyss: Dawn of the Deep Soul! (Direct sequel to the show btw)
My thoughts on it, sorta spoilery.
It's a little rough, but overall, mostly invested. Reg and Riko take a bit of a backseat for the plot tbh and new characters join the cast and there's quite a bit of drama.. And a few scenes of uncomfortable fanservice featuring preteens. (Yikes.) Conflict-wise, we've sort of already been here.. Very little actually changes in this sequel.. Riko gets her white whistle, Reg has berserk mode and a countdown for his Incinerator, Nanachi.. Just barely gets a resolution for her problems. They all head down to the 6th layer. In any case, everything else is mostly on par with the show.
Further thoughts.. I know the show is supposed to be a grim journey down the hole but like.. This movie makes me rethink continuing the series lol and like the author's clearly demonstrated that it's only going to get worse as it goes on given the nature of the world they've built so idk.. Fantastic in terms of worldbuilding and animation, but kinda awful with how it treats characters we're supposed to care about