If you’re using a mobile device, One Unspecified Period Of Time At Kevin’s does not support mobile devices (due to the controls being keyboard-based), and mobile support will not be added.
If you’re not using a mobile device, consider either downloading a browser which can zoom out (such as firefox), or, if you are on Windows, downloading the Windows build of the game.
Alternatively, if you’re still unable to zoom out for some reason, click on the translucent square button on the bottom-right of the game viewport. This will make the game fullscreen, allowing you to not need to zoom out.