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I want to give the devs the largest percentage of my money and get the best version of the game available. Would buying it on steam satisfy both those conditions?

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Yes and no, you will get the most stuff, easier online modes and more but also it just adds achievements to actual gameplay

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how about the cut that the devs receive?

steam take about 30% , and in itch they have a system where the developer can decide what percentage they want to share with the platform but is set on 10% as default (and the developer can decide on more or less )