I like the chip tune sound and feel you have going on in the piece. I think I would've liked it a little bit more if you brought up the tempo and put some arpeggiated moving lines some where in there. The mix sounds a little dry also. A little bit of reverb goes along way.
Change the instruments up also. Using the same instrument can make it feel like you're listening the same melody over and over again even though the melody is different. Composers will play a melody using one instrument and then play the same exact melody on a different instrument and people will think that its a new melody when in fact its just a new instrument with slight variations in the melody.
Overall you have a good start to something here. Keep at it buddy! =D