It's a web app. Go to:
wefwef.app
On your mobile's browser. There's a "settings" icon on the bottom right. If you click "Install" it will add the web app shortcut to your home screen which allows it to run in full screen mode.
I suppose the web app approach was to make it portable between different operating systems, and I wouldn't be surprised if native apps appear on both platforms once things start moving along.
Or -- Christ it's 2023 -- Apple's first fucking USB-C phone. Holy mother of god, having one stupid cable for the devices I want was a siren song of a mad god, but we're finally here.
In 2023