After you kill the first guy, go to the left and kill the second nurse. Take the kevlar and the MP5 with all the ammo. Close the gate behind you and step back from it for like 5 steps(this is important otherwise they will not come from the front and will get stuck in the left room). All clones will come to you from the front and no one will shoot you if stay behind the left part of the gate. Shoot close to the gate so you don't hit the bars. When the clone is dead, take his gun. Repeat the process for ever...

I need to use the bathroom

It would be great if they do that to fix a lot of the issues the game have

I cannot seem to alt tab out of the game properly, it just remains on the screen and I cannot see any other programs I want to go to

aiming is horrendous, the ai literally get pissed off at nothing at all, theres nothing that tells you what you can do, and you die INSTANTLY, only takes about 3 hits