Found a crazy bug. At the level completion screen, the noise from gaining badges gets "stuck" and you hear it for the rest of the game unless you refresh the page.
The hard badge wasn't hard at all. I stayed close to the right side, while strafing back and forth. Then switch to the top and strafe downwards. Slo-mo to dodge and rage when it gets rough. I had full health at 150,000 so I ran into a bunch of bullets because I really did waste twenty minutes of my life. haha
If you're unable to see the game without scrolling up and down then follow this simple trick. Hold down the Ctrl (Control) key and scroll your mouse wheel up to zoom in and down to zoom out.