Thanks for your remarks. :)
The holes positions are random in a restricted zone (in the center of the room) to avoid to get one hole in a front of one door, there is also a test to don't spawn the visitor in a hole. I choosed to make the visitor's trajectory unmodifiable as long as he was scared to avoid to modify constantly it, Imo makes the chalenge more balanced, but that's all about gameplay tuning. ;)