You can now use the gun to launch yourself a tiny bit backwards and you can go through walls with it now. R to go to respawn, arrow keys (not down key) to move, wasd will not work, space bar to shoot.
Hint: boss is slow and takes 5 shots to kill the boss ghost. List of things you can try: glitches, killing all ghosts, landing on the side of a platform by using a gun.
