Shows promise
I dig Worms, so anything in the same vein is worth a look. I'm not a fan of slasher metal myself, but most of the in-game music worked well enough. The challenges were also a nice addition to ordinary gameplay.
Could this be the start of a new flash game dynasty? With a minor graphic upgrade, some new weapons, and even a bare bones plot, this could become something great. I'll be looking forward to a sequel.