Your browser doesn't seem to support WebGL. If you downloaded the game please follow the download instruction on the game's page.
You will have to extract the content of the zip file first before you can run it. in order to so, you can use programs like Winrar or 7zip for Desktops. If you're on android it should be able to extract zip files by default but if it can't, try to look for zip extractors on android
