Gets a 5 for the odd meter and groovability. I like the different minor chords to each ear, blending to sevenths and ninths -- or that's what it sounds like. The melody around 1:15 is infectious, as well. I could listen to this for days.
However, it isn't perfect. At times, the melody feels a little glaring over the background, if you're going for full relaxation. It's hard to make relaxing sounds in chiptune though, so I respect you for that. Anyway, it's a very minor complaint. Doesn't affect my listening. Great work!