I've been loving the game up until the Seventh trial for Futo's little expansion, and I have to say that after a certain point it just makes me want to break my vita in furstation for one simple reason:
Big Suikas and Tenshis do not require Line of Sight for their ranged attacks and will pelt you from several rooms away.
This makes it entirely possible to outright lose a room because you get held up, can't reach or find the Suika or Tenshi in time, and just get pelted to death. Now imagine this happening several floors in a row, causing you to completely run out of healing items, and then die with no chance.
Very frustrating. This is on top of the nonsense everyone else is capable of, but at least you can pelt them from afar or spend consumables on them. Since the Suika and Tenshi are in another room entirely, there's nothing you can do but try to rush to them and hope you reach them in time.