You can link directly to the app, though it’s not well documented.
The basic structure is as follows appsheet://app?appGuid=781267c7-6677-43a3-98f3-dce9a90a7e3a#appName=USNationalParks2-90741&page=slideshow&row=Acadia
So the most basic usable link would be appsheet://app?appGuid=YourAppGuid#appName=YourAppName
You can get the appGuid from the fullscreen preview of your app, and the app name from the editor url.
The fullscreen preview can also help you craft the hash (#) portion of the link.
The docs at help.appsheet.com - App Column Type (Deep Link) will have a little more information. App Column Type (Deep Link) help.appsheet.com