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Are you unable to charge for the finished game on Itch.io ?

That is possible, just I'm hesitating how is it morally okay if a game is free from the beginning and after finishing it it will be payed one.  
Amm this sounds strange...  :D

I'll try to explain another way:
Never thought how I will make v1.0 anytime and I said erveryone this will be free forever because I'll never finish it. or may I'm overthinking it?

Well all I can say is that I think a finished product is worth money. The game that people got for free can be seen as a demo. Just my opinion. Will some be mad ? Probably but you can never please everyone.