Terribly glitchy
After I shot the first guy and went into the second room with the two head things, the game totally locked up. I was stuck there, the gun shooting at nothing despite me not pressing the fire button, the curser completely unable to move and I was left incapable of doing anything until the second head thing killed me.
I tried playing this about 4 times and it did the same thing every time. I don't know how the game was intended to play, but I had no fun with it whatsoever.