You dirty bastard >:U
Ah this is a cover, I don't know that Mastodon band... Well, this is nice cover, nice riffing but sometimes, some riffs are a bit off tempo. For instance the very first riff is a bit late, but since you are a fucking true metal guy, I'm sure you don't fucking care :P.
I can assume you also don't care about the sound quality. I'm not saying it sounds bad but you could improve the mix and fix that clipping. Though I liked the time signatures. Around 1:34, I think the groove contains two bars of 4I4 and one bar of 3I4, that sounds nice :D. Your lead tone sounds a bit weak though.
Keep on rocking dude :). Also I noticed you are from Belgium. I'm from France, so we are quite close. 5'd mofo.