From what I can see, there are a couple of things can could be causing this:
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You haven’t set what platforms your project is available for. Even if the project is available only for pre-order, it still needs to be marked as (eventually) available on specific platforms.
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I’m not sure if games that are not released yet and are only available for pre-order are meant to get indexed.
In any case, your page is still public, so you can freely market your project in social media and other similar tools.