Some bright fastr players have pointed out (by exploiting) two bugs that allowed impossible scores. One involved sending a non-number as the score (which I fixed by only accepting numbers as scores). The other involved sending a negative score (which I fixed by not allowing negative scores). Both were simple enough to fix, just problems I hadn't considered previously.
I know at least one, and possibly both, were discovered by a player named "cheatrs nevr prospr," which I must say is a clever (clevr?) name. While I would appreciate more if people mentioned these bugs to me directly, it's still nice that someone is going to the trouble to poke around the edges of the game where I never thought to.
Btw, please do something about the cheaters. There's one online right now going by the name of Cheatara. Racks up 10s more than there are tags.