Swapping between heads like security cameras is a pretty neat concept.
Regarding the gameplay, I also found it a bit confusing at first but I understood it better after playing some more. However, I didn't understand how to deal effectively with the shrine maidens and also what enabled or not the Kogasa buttons. The last night was really tense, I only had 3 heads left by the end.
As an aside, at one point in the Kogasa map, some fairies were attacking Kogasa but they seemed to be too far away to respond to either distractions or attacks.
Back on topic, it's pretty crazy to see a 3D game made in RPG Maker, I didn't know that was possible. But the 3D performance definitely suffers for it. My laptop is old but I know it can do better. If you plan to make more 3D games in the future I suggest using a dedicated engine so that you can get better performance. And in general, a blur effect can be pretty heavy on the GPU, so an option to turn it could be useful.
Finally, the art and the 3D models were very cute, and I liked the sound ambience, and overall the interaction between Banki and Kogasa was heartwarming.