Since this is a live performance, you have to be a little more forgiving towards the things I'm bringing up, but they still make the song a lot less enjoyable to listen to.
The strings (or, these are the most obvious ones, at least) are sometimes horribly off tune and the vocals are too, although it doesn't hurt as much to hear a voice off key as it does a violin. There also seems to be plenty of microphone popping that bothers me a bit.
Aside from these things, and it's not like they can be helped now, the arrangement is nice and the idea is fun. I just have a hard time listening to anything that's off key. Keep practicing