It’s a bit of a bummer, that space made me scroll down the page. Perhaps you could have linked the hosted version ( https://v6p9d9t4.ssl.hwcdn.net/html/3735351/GameDevJs Mirror 2021/Game/Level1/index.html ) in the description.
Once I opened it in its own tab, I could play both levels (but the ground of the second level exceeded my viewport).