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Yes it is free but offers limited content
Anyway, we'll know by the end of November.
Either because of your lack of English skills or some other reason, you are not understanding.
You can play nearly all the content available if you play v0.20.16 - which is FREE from the developer at the link I shared.
v21.0.0 is a PREVIEW of the new version of the game. Content is still being migrated from the old code / display ratio /etc into the new version. It will take months, if not years, before it will have all the content that is in v0.20.16. It is also FREE from the developer at the link I shared.
If you want to play nearly all the content currently available - play v0.20.16 for free.
If you want to play what little content that you can only find in v21.0.0 but not in v0.20.16, then play that version for free.
This isn't hard.
But the game has always been, and is currently, free from the developer to anyone who wants to play it. No pirating necessary. No $$$ necessary.