Amazing game! I will say I quit at first because it felt poorly balanced in the beginning. I missed 5-6 hits in a row and got demolished, and I had found one of the possible party members but never got the chance to summon him, so I was grossly unmatched against bosses. I decided to retry it because the game felt so fun when I made progress, and after I started to be able to summon party members, it got MUCH better and the rest of the game felt more fair.
I 100% the game and all of the endings were great. The story telling is really creative and I love the atmosphere. There are still a couple of unanswered questions but I think that might be intentional. The music is great, it feels good to play, and it was super fun.
One technical issue: when doing the final boss for the "Survival" ending, mine and my party members' HP bar was not showing any changes when we took damage or were healed, and it did not show status effects for the entire battle. One of my party members died and I had no idea.
Aside from that, everything was extremely polished!