2/5, the beginning music once it loaded was loud and obnoxious. Also, the lag-time on the cursor combined with the unit freezing when you leave the screen is a very annoying combo for the mouse movement.
Took me 6 tries just to get over 100, but once I did, I hit 203. I stopped concentrating for like 1 second and confused my WASD with the arrow keys and it went to crap. It gets super hard after 180 (2nd difficulty increase.)