Spoilier Alert!!!!!!!!
Always one survivor.
To kill the alien be fast! close the door then click one tap on the bath click the toilet role now click the bowl of the toliet (where u sit) and flush now get ready. open the cuboard below the sink get out the hair dryer click the plug :SOCKET: now turn on the sink tap click the water in the sink now fastly pick up the gun thats in the cuboard and carry on clicking that gun you should kill it.
Tah dah!
Yeah i have no effing idea what happend, i was just falling tough the floor and hiting right, tthen it said falling blocks and i stood in the far right cornerand dageded ALL of the blocks. then i was on a circle i got owned.... horibal game. 1/5
good tip for the last level is to go to the far right of the screen were theres a drop in the ground. stand under the hill and shhoot the gernade launcer over the hill when they come and they'll back off.