I have been stuck on the second puzzle for an hour already. I'm gonna be called a noob.

so i just got the game after watching a youtuber playing this game and i cant even start any levels at all here is what im seeing screenshot any help is appreciated i really wanna play this game!...

The game runs Ok ,but I am running it via Proton in Linux, everything loads except the people so it makes it hard to try to kill them. So does any one know of a fix to get them to show? Or do I need to return the game as unplayable? it looks fun I saw it on Gray still plays and I really would like to play it, but as I don't have windows I need to run it though Steam's Proton run time, but I don't get the people to diaplay, and wonding is there a way to fix this....

I've three starred all the available missions yet half the mission complete achievements never unlocked. Are they broken or just not enabled? Also, where is this cheese on every level? What even is it? lol

I have completed the game & achieved all skulls. Check out the link below for hints