Thank you for explaining.
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Interesting point. Had a look at the rules, they don't forbid adding additional rules. Check the Custom fields section: "if sourcecode a requirement for submission", "if you your game must be released under Creative Commons", etc. The mentioned license basically makes the game uncommercial (non-profit), if someone will redistribute it then credits to the creator should be given, mention the changes made, provide the same license further. Correct me if I missed anything.