Edit : -- No longer is a thing since a good while. This doesn't fix anything anymore --
I found how to fix the main menu.
Open up "sharedassets1.resource" with notepad++ or anything that can open up the file as text then find just right up not too far from the start :
<xmpDM:videoFrameSize
stDim:w="1920"
stDim:h="1080"
Change it to something like that (or anything else, haven't tried) :
<xmpDM:videoFrameSize
stDim:w="1280"
stDim:h="720"
It works. It may have to do with lower resolutions just straight up crashing the game instead of not working, but like that it somehow disable the main menu video and just doesn't crash the game.
The AI is a bit braindead, seems to have some blindspots where they can't seem to "find" the character. Some spots lead to camera wobbling all over, probably due to the same reason jumping is way harder, something wants to keep the player *tightly* stuck on the ground. Just walk a few meters and they'll be able to understand you exist.