That is really good! Only a few minor inconsistencies. Here's my edit with a few subtle changes:

There's still a few things that could be done with it. I think the purple color of the Natsume logo is supposed be more blue and the purple color of the triangle and rectangle should be lighter.
You know what though? The PAL cover art is soo much better. I'd like to make an NTSC-U label using the PAL cover art but there's just no high res scans of it anywhere.