I really like the upbeat tone to it! The piano sounds pretty bright, and the melodies seem to flow together very well. There are a few problems I have with this one, though. The instruments are pretty simplistic overall, especially the sampled drums. Maybe you could throw some reverb on them to make them sound a little bigger? I think there's also a little clipping going on. Are you keeping everything below 0dbs?

I like your style though, man. Those melodies are really catchy, and I'd be hard-pressed to find someone sustain a bad mood over this. Keep on keeping on!