Certainly sounds appropriate for Halloween. Doesn't sound like true dubstep bass to me, but definitely a good start. All of the instruments of the song seem to blend together really well, so I can tell you have talent in music. It's not bad overall, but nothing really special either. I mean it's nothing I'd listen to voluntarily, but a good start for a work in progress. I don't think the synth riffs are all that catchy, but the drums sound really good. Unfortunately I don't think this would work well for any Halloween submissions I can think of really...just more of a random Halloween dubstep song really, lol. A good effort nonetheless, keep up the good work.
First of all, nice job, you're getting more and more original dude!
To make a sub bass, open 3xosc, lower the volume to 0 on the first two oscilators and then increase the volume to full on the third, that, in a nutshell is a sub bass :P
Please contact me if you would like to use this in a project. We can discuss the details.