The score is your hits multiplied with a performance factor that depend on your ratio of hitting and getting hit.
So your score rises with hits and falls with getting hit, but still rises if you hit an get hit at same amounts. Exact formula is score = hitOthers * (hitOthers / (hitSelf+100)).
The +100 is needed to avoid division by zero. Also without that +100 someone who managed to hit a player from long range a few times without getting hit at all whould have a very high score otherwise.
@barteldvn hit other players 5695 times. Other players hit
@barteldvn 2964 times. So his performance factor (5695/(2964+100) is almost 2. So his score is about double his hits.