Great bottom end and well-balanced overall. I think I'd experiment with reverb, especially on the clap and hi hat samples. If I was mixing it I might also try a pitch modulation plugin on the keyboard to make it more interesting. The only plugin I can think of that does this is Waves Mondomod (something close to the "Wow" preset on this)... but there may be some free alternatives out there. This one might do it, but I've never tried it Wow & Flutter by The Interruptor - Lo-Fi VST or even better here's one by Izotope Vinyl Overview | The ultimate lo-fi weapon.