Molokoy is a Progressive Web App, it is a new web technology that requires no data installation on your phone. You can add just the launcher to your homescreen/drawer for quick access. It will then behave like a standard app.
When you open the App for the first time it will prompt you to add a launcher to your homescreen.
If you do not see the prompt, that is ok, go to your browser menu (3 vertical dots usually in the upper-right corner), and click “add to homescreen”.