The interlude that starts at 1:30 sounds a little dissonant when you have that happy lead going along with the melancholy piano in the background... They both sound great on their own, but I don't think they should be playing together.
That said, this is still a really fun song, and you definitely managed to pull off a minimal track without getting boring, so this is a really nice first shot at the style!
Agreed, that synth just doesn't mesh with that piano in general. Maybe if you put the synth on the same key as the paino and double-timed it, it would be cool, have arps go as the piano plays chords.