The combo works as a point multiplier. first kill : 1 point, second kill : 2 points, third kill : 3 points etc.... But point taken. maybe It need to yield more so that it's more visible and rewarding.
Ah now I see it. But I believe there's a bug when you kill enemies too fast: you only score the last amount of points. (So if I kill 3 enemies at once, I only have 3 points)
