This game has some pretty serious faults although the overall idea is a good one.
"Accuracy" is extremely browser-dependent. It was extremely easy to get Perfects in Chrome, nearly impossible in Firefox for example. Browser-test rather than skill test.
"Reactions" is essentially a hardware-test rather than a skill test as well. Have much lag? You will do badly on "reactions". Have little lag? You will do amazingly.
"Perception" again, is mostly a hardware-test although this time in reverse. Have lots of lag? This will be extremely easy. Have no lag at all? This will be harder.
So where this game fails is it tries to be a smarts-testing game when in reality it is mostly a hardware-test.