Thank you for the feedback and yep, it's a ghost lol.
At the third level you where supposed to get down on the floor where the blue soldier is, get all the way to the right and posses the cientist, then you would use his skill to operate the computer (the one with "on" on it's screen) and turn off the turret at the begining. After disabling the turret you would be able to get over it and posses a mutant behind it, the mutants are the ones who can destroy the crates.
However due a glitch, you wouldn't be able to do it in time anyway since the mutant can't pass through narrow corridors.
The team will fix the game after the jam is officially over.