Played 3 minutes and already got motion sickness.

As the title says, me and a friend couldn't join in to play multiplayer, is there any kind of steps to do before so we can play together?

Can this game be played Single-player and with keyboard+mouse? Thank you.

you should make the console command key ` or * because f1 is my screenshot key

I don't understand what we have to do in the demo. I'm blocked with two doors at the very beginning. Is there a key somewhere ? I used the eagle vision but it doesn't point anything looking like a key. I think I opened every drawer. Where is the key please ? Also maybe you should give more sensitivity to the mouse. I was at max and the moves still feel very heavy (and I'm a badminton player so I have good wrist muscles ^^)...