So, I like the beginning of the loop (to about the 1 minute mark), but when the non-8-bit instruments drop out, it's too radical of a change (i.e. the transition isn't smooth enough), not to mention both of the instruments you have at 1:00 sound the same and occupy more or less the same space, frequency-wise, and are panned so closely together that they sort of meld, which I'm not sure you want. If that was the intended effect, then I'll defer to your judgment.
I was also initially confused by you calling it 8-bit, since the 8-bit isn't apparent until nearly half-way through this song, which is only 2 minutes long. Which leads me to what's probably my main issue with the piece, which is that while there's a decent framework for a piece here, it doesn't really go anywhere and, at least to me, it seems like it should. Granted, if that's going to happen, it'll have to be longer, most likely, to make sure it still loops nicely.
In summary, I think you've got something here -- it just needs to be fleshed out and polished a little more.