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A curated list of awesome FOSS games
(github.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Fair enough, in that case let's add it. But if you don't mind me sharing my opinion: you say everywhere that it's a pre-release software, and the 0.x.x version supports this hypothesis. If you think it's ready to be considered a completed project (but not necessarily also finished) you might want to be more explicit about it.