Oh no, I think I remember this. I fixed this issue just before the deadline(looks I fixed it only for windows). In the web version, the spawn points spawn enemies depending on the player position so the vampire can walk so easily without getting caught. But in the windows version the enemies spawn depending on the vampires' position. So this bug will happen only in the web version. I will fix when I get access to my PC. But I'll delete the web version for now.
Thank you a lot for reporting this bug!