I played up to the bow at the castle, and it was enough to know I was dealing with careful, thoughtful level design. Every room was a nice little puzzle and the enemies interact orthogonally in an interesting way. The aesthetics are solid, although I feel some AI art was used which always feels a little soulless for me.
I felt that I lost mouse movement for a second whenever I picked up an item, and having to switch back and forth to the amulet was a little cumbersome. More than once I forgot to change back to a weapon and fumbled the beginning of a fight. But I assume these are limitations of EFPSE.
Speaking of which, do you provide example scripts anywhere? Your enemy behavior is very interesting and I'd love to learn from it.