I wanted to leave hints on the walls through spray paint but it never materialized, should have just added text... my bad. Thanks a lot for trying it out nevertheless!
Hint for others: If you don't have a webcam or do not like to blink often, press B when you feel lost! Also, blinking near the lights take you to the next level (again sorry for no text feedback)
(in my defense, the integration over web took like a day and a half by itself, thanks again for noticing)