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There's a problem with that: if the game opens in full screen, where do you put a description, downloads, comments, buttons to link and rate the game...?

It's not full screen, it's the same as if the game size matched your browser window by accident. If you leave a little bit of padding as in my example CSS, the top menu bar and a part of the description are still visible so the visitor can realize that they can scroll down.

Here's a video of it in action (flashing epilepsy warning):

https://a.cocaine.ninja/gpwttb.webm