5 for charity
I'm giving this a 6 because of the charity. Honestly, I didn't much care for it. I actually stopped paying attention to the game and just held down the arrow keys until I finished.
However, you DID make a game, whereas I have not, and you DID put the effort into it, so you have me beat. For improvement purposes, I'd say that making connected people a little closer would be nice, or perhaps adding more of a challenge other than walking.