Oh, actually Amos, you mention encouraging them to play through the itch app, is there a way to enforce the game only getting played through the app? I can enforce this from my end via the authentication, but it would be so much clearer for the players if there was an itch feature that just said "Only playable through itch client" and didn't allow them to download the build separately.
Viewing post in Discord Integration
There's no way to do that yet, when we first released the app we promised that it wouldn't replace the website — basically, that the option to download from web would remain there. There's alternative ways to authenticate using the server-side API: https://itch.io/docs/api/serverside — you could ask folks for their e-mail, check that they've indeed purchased the game using that e-mail, and send them an e-mail with their Discord key!