itch.io

That is true, if I had free time I would be one of the first to volunteer, with my 12+ years of editor/proofreader experience in the professional field despite English being my fourth language, if you really do desire to spend money, get Grammarly's premium package and run all the text in the game through it. But otherwise, there are probably a good hundred or more experts in the fanbase who could offer their time and help for free.