That's a bad ass theme lol...
I don't really see this fit into a tankman flash though.
This song has a few problems, for me anyways. First off, the guitar is nice but a bit too repetitive, in the first part of the song.
The drums didn't seem to fit with the song, out of sync maybe? Then the guitar changed and the drums should have changed as well but they kept playing the same just like in the intro and it sounded really wierd.
The middle part was nicer until the drums just magically vanished. I think that you could have kept the drums in there and have them play at a lower volume level and have them play less frequently, more softly until the beats starts up again and you put the drums back full power.
I liked the way the song ended though. It was nice.
This, if tweaked a bit, could be an awesome song. Good luck with the contest.