Vielen Dank für die Antwort! 
Sonst wird ja immer gleich darauf verwiesen, beim Publisher anzufragen, deswegen hab ich an Blooper Team gar nicht gedacht.
Die Publisher haben sich übrigens nach einer Weile gemeldet:
"Thanks a bunch for reaching out to us and for your patience while we've worked through emails. I understand you're interested in making a Let's Play video on YouTube for Layers of Fear 2. That's great! We love it when folks share their gameplay of the games we publish and this is a-ok by us!
If you use twitter, please feel free to tag @LayersOfFear2 with your video if you like! You can keep up with news and announcements through that twitter account as well."