Awesome for a first!
The drum line definitely has a groove. I'm thinking maybe you could add a bit more distortion to the lead sine wave; maybe even a deeper sub bass to couple it with. But maybe that's just me, and if you're going for more of a liquid dubstep feel, I'd keep it like this. Maybe add in a few more tracks, or switch up the chords/notes a bit--I'm feeling it's a tad bit repetitive. Other than that though, awesome tune! :) Props.