If you are looking to play the game or inspect the code, you can usually find it by searching for "BigTowerTinySquare" or variations thereof on GitHub.
Because it is open source, you will often find: big tower tiny square github top
You have the code, you tweaked the physics, and now you want to share your "Big Tower Tiny Square" fork with the world. The "top" way to host this is via GitHub Pages. If you are looking to play the game
Run this GitHub search:
big tower tiny square language:javascript stars:>10
Then sort by Most stars or Recently updated. Then sort by Most stars or Recently updated