I like the idea of stomping knights. I think this type of game would really benefit from some kooky sounds.

Could do with either swinging on an angle or doing arc sweeps. Those knights are pesky when circling. That stomp really comes in handy.

I like the mechanics, but I wasn't sure why I was being chased by little yellow balls???

A little polish could bring this a long way! Gameplay-wise, my biggest suggestion would be to work on giving the user feedback (it's hard to see when I'm swinging my club, for instance) -- this means adding a frame or two to some animations, and some sound effects (sfxr, ftw!). But the gameplay is mostly there, otherwise.

Cheers from a fellow ImpactJS user, and someone who wants to smash things (who doesn't?). ;)

The concept is nice and basic controls work okay.
I think the issues are mostly in presentation eg. I'd like there to be more visual feedback from destroying things.

Audio would've been nice too.

I killed a lot of peasants!