Thank you for playing and critiquing! You brought up some good questions! :3
The Song:
The version I used is listed as CC0, and the song is considered public domain in most countries as of 2019. If somehow I get a cease and desist or something, I'll gladly change it, but I highly doubt that will happen. The interpretation is a parody of 2001: A Space Odyssey.
Your interpretation of the theme:
A new beginning doesn't mean that things have to carry over from "An End".
The idea is you get so big you become the "Earf"...which has a cat that will eventually destroy that "Earf" and become new "Earf".
However, this is all subjective and you are welcome to interpret that any way you like (and I think that's pretty neat). :D
The Meters:
The total destruction meter is part gag and technically what determines your chonk level. It wasn't meant to really be taken all that seriously and was mostly for humor. :)
Thank you again for playing!