Thanks for your feedback !
I tried to do my best to fit the theme, I wanted to make a game where we control a nun possessed by a demon, specialist in exorcism, must exorcise a hotel, and each room in the hotel is a mini boss in two phases the first is with the nun who fights against a possessed enemy, when this enemy is defeated his demon tries to escape into the beyond we enter the breach where we find ourselves in the same room in reverse mode to defeat the enemy with the demon who owns the nun with the inverted crucifix.
The theme is not really in the gameplay, but more in the symbolism ^^;