I am debating releasing a game in early access, and increasing the price as more content is added, but letting people know that I will finish it when I decide it is done. So to always expect the game to only have whatever they got when they paid for it
The bold text in those sentences reads like a contradiction. I do not understand what you are trying to say.
obviously getting new stuff for free if they paid for a previous version, and maybe not getting all the features they hoped for in the end
If you charge for an unfinished game and expect people to pay again for new content, that is not early access.
Early access is paying for a full game and literally getting access to the game files while the game is not finished. It is selling the game for full retail price before it is done. The "early access" is just a nice way of saying that there be bugs and unfinished/missing content.
And a dev on Itch would be wise to not ask for full retail price, but give early supporters a discount for trusting the dev to finish the project.
If I end early access "early", is there anything negative, aside from upset players
There is no such thing as ending "early access" early. You either cancel the project or you finish it. Early access just describes the state of the project. And that is beta, or alpha and often pre-alpha. Or "in development" as it is called on Itch.
If you promise "early access" and do not deliver, for example by uploading "new" content as a separate project, your customers would probably be eglible for a refund and might not be inclined to buy your "new" project. The thing is, it is not "new" content. It is content that was supposed to be in the game in the first place - because it was not finished.
Someone paid me $10 for the game I have up. My cut to itch.io is set to 10% (I believe this is the default). However it says my payout will be $6.40
Taxes. If you sell something you have to pay taxes. And Itch does the exact calculation at the point of payout. Be sure to do your tax interview before you try to request a payout.
And as advice, do not use a minimum price without a demo. No one knows you. Why should they try out your game if they have to pay up front. There is no general refund policy like on Steam within 2 hours of playtime, no questions asked.
Also do not make a one liner devlog/update every few hours. Your game has 12 devlogs and is 6 days old...