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This isn't working for me for the game Mindustry: https://anuke.itch.io/mindustry

The game is already in my library, and I want to gift it to others, but there is no "Give this game as a gift" option for me.

Anyone else having this problem?

its a free game, is all 

you cant gift free games just send your friends the link

That's the only option for now, yes.  Thanks!