README file is great, but since this is open source, you'll also want to have a LICENSE file.
Interesting concept. The screen is a smidge small for web pages. Add some sound effects and music to make this game immersive. I enjoyed the large space to explore, maybe start with it a little smaller and get better through the levels.
Oh easy, yeah for the license, you can just go to GitHub, create new file, name the file: "License.md" and you'll be presented with some options to create a license file. There are templates and things so you don't even need to do anything. For a game, you'll probably just use the MIT license. Let me know if you need help with this and happy to show you anytime.
