Press Publish, write a note and choose who can see it. The game is live at a permanent play address, streamed to any browser. Set it to public and it appears in the showcase; unlisted keeps it to people with the link; off takes it down without giving up the address.
Every published game carries an app manifest, so players can add it to a phone home screen or install it on a desktop. It opens full screen with your name and icon, exactly like a native app.
Each publish is a snapshot with a note and an author. Restore any version into the editor, compare what changed between scene snapshots, and nothing goes live until you publish again.
Give a game its own multi-page wiki at its own address, and give your studio a public profile page listing everything you have shipped. Both are hosted with the game.