Oh my. I found a bug.
If you play for long enough by being hidden enough when the light starts to get faster and therefore reach the last medal's score a little...later, you'll get to a point where the light fails to exist. Like, it got blink of an eye fast, and then it disappeared completely. Once that happened, I was able to not even focus on the game and just let the score climb indefinitely.
Seriously, my score just passed over 10,000 with zero effort.