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Will I be able to buy the game on Itch when the game is finished I would like to support you and Itch.

I can't be sure already, but the full game probably won't be on :/

Any hope for GOG at least I don't like using Steam I hate their client and all the bullshit surrounding it.

I second this. I dropped all DRM laden games over a decade ago and only buy from DRM free sources.