HaHa, Metal Bat.. good name.
Though the guitar got kinda boring because it repeated, the whole song was really great. In fact the guitar riff sounding like something from Doom (I've actually never played the game before, but I have heard a couple Doom remixes on NG.) The drumming was really good, except I think you should have changed it around a bit.
The way you introduced all the elements of the song (the guitar, the bass, and the drums) was really good.
I also really liked that uhhh, can't describe it.... the other sound you had besides the bass, drums, and the guitar. But I didn't like when it carried on during the end, it was slightly annoying.
There are a couple things that could be improved, but overall a good song. 4/5
Feel free to check out any of my new songs.