Heh, I'm starting to sound like a broken record, but most of the remixes in this style seem to suffer from the same issues - not enough bass (is there even a bassline here?) and the guitars are a little hot on the mids/highs. Some simple EQ work could fix the latter. I can't hear the vocals at all, and I can't tell if that's meant to be a stylistic choice or if they're supposed to be audible lyrics.
Gotta say though, there's a lot going for this. Awesome synths, the use of ambiance/pads is also fantastic... Great take on the source, I'm not intimately familiar with the original but I've definitely played more than my fair share of Paper Mario so I'll have to do a source check before you send this one off. This is definitely submission worthy but I'd check on the bass/vocals, and also see about toning down the rhythm/lead guitars so they're a little easier on the ears.
Was very pleasantly surprised here though! This is close!
EDIT: On repeat listens, I'm hearing a lot of chord usage but I'd like to hear it from you where you've used the source throughout the remix, if you're willing to oblige.