Ever heard of Anamanaguchi?
Criticisms; The guitar needs to be quieter and the drums louder, at the moment the guitar drowns most other sounds out so when it's playing the only C64 sounds you can hear are the higher frequencies because the guitar's dominating the lower and mid ranges.
If you EQ the drums, increase the kick 's volume at roughly 100hz and the same to the snare at 200hz to give it a really punhy sound to suit the rest of the song. You also might want to add a filter low pss filter on the guitar, but keep the knob/dial/slider; whatever controls the cut-off freq, near the top/end.
Aside from that, the melodies, harmonies and synths are all really good, keep it up!
Not sure if what i typed makes any sense, but I'm lazy and i can't be arsedto check.