Love the atmosphere of the game, it's unique and trippy as hell. The game feels like a puzzle where you have figure out what to do next and requires exploring every nook and cranny. The soundtrack is great as well, I especially liked the song in the area with the fishes.
I just finished the Hallowed Mother fight. I beat that one by pure luck because if she spams her hook attack there doesn't seem to be much you can do about it as it can kill your party members in 2-3 hits. I was only able to beat it because she decided not to use it as often and used her status effect spells instead.