It sounds great : D my favourite part is defenitely "ashita wa kasa MAAKU ame" for some reason ...
about the mixing, I sounds very good in timing ... but something that could be nice, mostly for groupdubs but it's sounds good in fandubs too ... i don't know how to explain it, but if you make it in audacity, you invert one of the tracks after splitting them, right? to make it sound a little more like the original instrumental, i select the parts where they sing and invert them only ... as i said, that souns better in a groupdub for some reason ... imo.
tl;dr D8 >