I love that you have a README (that's really awesome and comprehensive), and I can kinda see a license file, but rather than a few licenses in the main README, you need to license the full repo. You can do this by adding file to your main repo: license.md and you'll get an option to choose an open source license for your code.
The music is great. Looks super fun, except the controls don't work when I start the game. I can only click the mouse button which will make the character jump. Click back out and into the tab again works (could be a me thing, but maybe worth investigating just in case). I like the double-jump; super fun. I like that this is a different angle on "balance". Nice job.