So I managed to cop around 15000 score, probably not impressive but whatever.
Mostly I found that the whole game just revolved around kiting until enemy spawns outbid your retreat vector, which probably isn't a problem. It is a shame that when enemies drop weapons or pickups, you'll never get them because they'll drop right in the middle of the horde you're kiting.
I am running this on a toastertop so maybe that's just messing with results.