Not bad. In fact, quite good.
I really don't know. Something about a little demon chewing up human like figures is just hilarious. It's quite fun, as well. Jumping was a little frustrating, but other than that minor flaw, everything worked perfectly. The roar was a nice addition, and the monsters all blended in nicely. I wasn't expecting much, as I was told about this by some guy on Guild Wars, but it turned out to be a nice twist from the run of the mill shooters people churn out every other day.
So, yeah. Nice and all that.