I really enjoyed this concept, and would love to see it fleshed out into a full game. Having movement and attacking was a particularly inspired choice.
That being said, I feel like the numbers are skewed too heavily in the enemies' favor. They don't seem to roll that low, and there's a lot more of them than there is of the player. It feels really bad to get multiple ones in a row and have nothing to do about all the enemies ganging up on you.