Hi there! I’m happy to see you’re interested in editing ChoiceScript games. It’s surprisingly fun and rewarding to dig into the full text of these games and help them sparkle. You may want to consider setting some boundaries for yourself, though, especially if you’re offering to do it for free. There’s more variation in Hosted games, but regular CoG works are a minimum of 100k words and are tending towards 500k words and up these days. That takes a good chunk of time to edit.
Also, there are many unique aspects to editing game code, even if CS is more intuitive than other programming languages. Making sure gendered variables agree with the verb tenses (s/he runs vs. they run) and making sure dialogue flows correctly over goto’s and gosub’s take up a significant portion of my copyediting time. So, you should make sure you’re familiar with the basics of how the code works.
Furthermore, there are many different levels to editing, from a full writing partner suggesting revisions to the story arc to very light copyediting, just ensuring the em dashes and ellipses use the right format and there aren’t any obvious spelling errors. You may want to think about what level you’re comfortable with and being upfront about it so the author knows what to expect.
Lastly, you may not need to offer your services for free to build your resume! If you haven’t already, you may want to contact Choice of Games to see if they’re looking for more freelance copyeditors. They have a test that’s also very educational in what you’re going to see while editing these games, plus they have helpful style guides and instructions to focus your efforts. Plus, they’re really great people to work with.