The escape chance is actually just exactly as shown far as I know, although I do question how unreal engine does probability sometimes because yeah sometimes you'll escape really easily a lot of times in a row and sometimes you just wont so idk what happens there.
The encounter rate is set up to be very high in dark places but areas near light are immune to random encounters, which i'm not sure how many people picked up on but I'm also aware there are some areas that force you to go through a lot of dark spaces (particularly in the third level).
Glad to hear you enjoyed it!