does this mix sound ok? what can I improve? (Metal content)

I'm not the biggest fan of the drum sounds specifically, but that's just a matter of taste. You have a compressor on the entire drum track?
 
I'd do 3:1 or so ratio. Pretty fast attack and release. Try to hit 3-5 db reduction. Then tinker around with the settings a bit to see if you can get the cymbals to ride a little better with the shells.