Good sound, but needs stereo!
I think part of the reason you're getting complaints on the strings is that this piece lacks any sort of stereo panning. You need to move some instruments around to make the piece fuller, either that or something got broke when you exported/uploaded this song and it's mono instead of stereo.
Aside from that, musically the piece was well done and well thought out and enjoyable. Only thing I didn't much care for were the ?cello? plucks around the 1:05 mark. But again.. with better stereo panning and some level adjustment they'd probably sound and fit just fine too.
Hope this review has been helpful :)