I composed most of this song, but the square wave melodies were sampled from "apple loops" (specifically the ‘8-bit Legends’).
Apple Loops, at least to my knowledge, are free-use as long as they are not commercially sold standalone.
[[[I composed everything else.]]]
You may only use this piece for commercial purposes if your work is a web-based game or animation, otherwise you must make specific arrangements with the artist.
* Contains third-party samples.
Excercise caution when using it, refer to author comments / contact the author for details.