This is a very nice mix. The instruments sound great, no real issues except for the "chirp" right at the beginning. But that's the only problem I hear, and it's hard to even tell it's there once the song starts. If you can get that fixed, that would be the only thing I can think of.
I know you're looking for things to fix, but I can't find any real problems. I am still pretty new to this, so take it with a grain of salt, but I really like it.