Good For A Menu Loop
I have heard this mistake made in many many many many songs here on Newgrounds... and that is the mistake of using to many organic sounds. This is fruity loops right? It is extremely difficult to capture a nice "real instrument" sound. This is a nice little menu loop, however, and would be good for credit music.
I personally have no experience in creating real sounding instruments, because I personally prefer stay electronic with synths and pads instead of pianos and guitars. Perhaps you can try getting some tips from the orchestra pros here on NG.
This is a very clean song, however, and is mastered well. I enjoyed the filtering you used and how you stayed simple. It is a nice mix of organicness, so it actually is pleasant! I didn't like 0:55 - 1:21 to be honest.