Very well done with tons of polish. Think I really needed to grab a mouse instead of using the touch pad, but was able to make it to 14 enemies by pointing the arrow at my starting position and then clicking like crazy.
I think 14 is about as high as I got. Motochaos is the one who's gotten the farthest: I was chatting with them about strategies: "OK: first you go all the way to one side and get them down before the others can get to you..." 14 is outstanding for a touchpad: I don't think I could do that.