The drums seem pretty thing and lost in the mix. Maybe try very lightly sidechaining the subbass to your kick or kick/snare pattern so they punch through just a little more. You may also want to try EQ'ing some unwanted frequencies out of your other instruments.
I don't really find the main organ lead to be that appealing, it sounds like a generic organ thing.
For a happy tune you may want to look up some typical chord progressions for happy/euphoric/emotional tunes. It sort of sounds like randomly chosen chords within the key/scale. The bass isn't that bad, if you haven't separate your sound into low/high you should do that as well. Separate 150 and below from that sound and have a pure sin wave with no effects play the same notes as the gritty part. That way you get a nice clean sub sound while keeping the distorted sound. You can try 1 sin wave and 1 square wave playing low and filter the highs out (cutting off everything above 150hz) and detune the square a little to give the sub a little movement.
Overall I would say work on cleaning up your sounds with EQ'ing, get your sub bass clearer (look up some frequency splitting tutorials for basses on youtube), and look up some music theory to look at chord progressions.
