A little rough and unoptimized but the framework is excellent. The cutscenes really make the atmosphere.
I think my only major complaint would be the battle feedback, or lack thereof, from certain attacks. For example, during the boss fight, I found it really weird that I would just get randomly damaged if I attacked while the boss was doing the 'retreat' animation; she doesn't counter, but I would get knocked down if I struck during this state. Also, there's some of the Otomo attacks that deal damage but there's no Ceci "stun" state, so I couldn't tell WHEN the damage is active. It took me a good while to figure out what part of their attacks do damage.
With that said, I am loving the idea of a Cecilia souls-like. A full blown game of this would be fantastic.