i just thought that using things u found in the school to make weapons would be fun and interesting not to mention funny as hell, like combining a saw blade from shop class with a hockey stick from the gym, u could create some funny ass weapons kinda like dead risings weapons, lol
fear is all well and good but add some comedy in there from time to time to reduce the stress of the game momentarily can add some additional aspects to the game, u could literally be on the edge of ur seat until u get to a safe area and then laugh at the ridiculous weapon u created to kill the monsters, itd just take the edge off....for a minute, lol
oh and to add to the fear while having combat u could go the alan wake direction, enemies can only be hurt while in light, so ud need to have another team mate shine a flash light or torch at the enemies so u could kill them, and u could toss in some enemies that dont die u can only drive them off temporarily by dealing a set amount of dmg to them, but theyll return to wandering around in random locations until u run into them again, kinda like the regenerator from dead space, thatd add some high levels of fear to the game, nobody likes bumping into the invincible enemy, lol