If a game’s files are missing platforms, then the app doesn’t know if it can download and run them. In this case it will fall back to an “open page” button. Please make sure you’ve tagged the platform (Windows, macOS, Linux, etc.) for your game’s files. If you’re having trouble with someone else’s game, you can open a report from the bottom of the page and someone on our team can update it or forward the report to the developer.
Thanks