Style: Thrash Metal Instrumental [3:31 in length]

This is the first song I've ever written I guess. I've recorded and tabbed out allot of my riffs, solos and ideas but never really attempted to make a standalone song out of them. I lack good recording gear so I decided to make something purely using guitar pro 6.

I'm not a drummer so I had to experiment allot with the drums and so I'd appreciate some advice in that area as well as the song in general, i.e. how it flows, what I need to add/remove and changes in the mix.
Enter The Tomb.gpx
My shitty gear:
Danelectro Fab Metal
Zoom 505 II
ESP Ltd MH-50