After playing this game again for 30 minutes straight because I was bored, I realised it just stopped getting harder, and it wasn't challenging at all, (at least not for a pro gamer such as myself :P)
I was expecting the worst, but it never came. To not get myself tired from clicking for 30 minutes straight, I only wait until the guys are lined up or close together and then I can kill two birds with one stone, or more rather, two bugs with one web. I gave up at approx. 20000 because it wasn't getting any harder.