Thanks for the reply, newt. Did I mention I'm a total noob?
1. I don't know what local storage is, let alone if I have access to it. I found this info
from a quick google search, but the code parts are unreadable to me because I don't know anything about Java Script at all.
Do I need to know Java to have access to local storage? Is that even the right question to ask?
2. Again, did I mention I'm a noob at everything other than setting up a wordpress site and playing a bit with the css?
3. Per #2: My understanding so far is: I would create a game and it would be exported in a file in HTML5 format. So I would have a file, yes? But then, what exactly would I do with that file? (and if the answer is "upload it" rather than paste it into the HTML editor when creating a wordpress page, I would need to know pretty much exactly where to upload it to. I do have FileZilla and can see where the wp-admin/js directory is, if that's relevant at all - is it?).
4. See #2 above, I am not kidding around about that. As I suspect is now obvious.
Apologies in advance if this is too basic to be asking here.