I liked your game, just something that got a little weird.

The protagonist (Bartho) he is a devil correct?
By history he was sent to the world of humans to collect the blood of the Priestess.
In my point of view, he should be in the world of humans as a human, and not as a devil with a horn and a tail since he is infiltrated there to corrupt and harvest her blood, it's just something that was kind of meaningless.
A divine being like the Priestess, in the spirit world she would know by seeing him with horns and a tail that he is a devil, so in short, this was pretty much out of the act from the perspective of the undercover infiltration story.