This is an NGADM 2015 review.
Dude I gotta give you props for your lyrics. They were engaging and fun, and I really couldn't fault you for much on this song, especially given its simplicity. The lyrics might be a bit repetitive at times, but you wrote them for just about the entire song so I can't blame you at all. The only issues I have are related to your mixing and your bandpass vocal section.
So first off, your piano is so sick. Love the jazzy vibes and energetic rhythm. The piano itself sounds amazing, too! Very thematically appropriate sound.
One of the first things i noticed after you introduced your vocals is that they were a bit loud, and a bit low. Honestly it seems to me that you need to highpass them a bit, because they're pretty strong down to about 150-200hz, and it creates this feel of imbalance in such a simple mix. They're also a little poppy at points, so you might want a better pop filter or simply stand a little further from the diaphragm. Either way, they're pretty well recorded apart from that! The highs in them are quite nice as well. Nice short reverb.
So, the other thing i had was the band pass vocals. Because man, your song is about -18RMS usually; which is very quiet but fine for this kind of music... but it's telling when the bandpass bit is at like -10RMS :P. It's reaaaally loud and quite piercing as well, so you might wanna turn down the Q on your filter. Just after that you had a really sick piano transition though so consider those points earned back haha.
Overall, a pretty well rounded song, especially for just piano/vocals. Nicely done!