I'm sorry but for some reason, the web version doesn't work. There is also a known issue with the Windows version of a white/grey screen this is because of post-processing. I don't know about Linux and Mac, as I didn't test the game on these platforms!
I tried it again today by downloading it and got to the game screen (with 2 teams and a soccer ball in the middle), but it doesnt seem to matter what buttons I press, the game seems frozen :(