Not bad at all
This was some pretty addicting tunes. I really like how you started off with a drum bit. Most of it sounded like a mix between Black Sabbath (appr. 1975) and Deep Purple (Machine Head era). There are 2 complaints I have.
1) I feel there is too much synth in the song. This tends to overpower the guitar parts.
2) This isn't a very big complaint, but I think it needs some lyrics.
There are some fairly simple ways to change the song for the better, in my opinion. Instead of relying on the synth, perhaps the use of an electric organ might be better. And for the lyrics, just team up with one of the talented lyricists and/or singers on Newgrounds.
Good stuff. Peace.
~ the Crab