Thanks so much for playing!
This is the first time I've messed with Enemy AI and visual filters, so I'm sorry that they were a little lacking. My initial idea for the creature's behaviors was to have him follow you around slowly, and if he gets too close then to charge at you. Unfortunately I think I just made the map too big, which is why he seemingly disappeared during your playthrough. If he got stuck, you would've heard him due to a bug I wasn't able to fix in time lol
Thanks so much for the kind words and feedback!