Andrew, I highly recommend to put your game available to download.
Web templated produced by Inform 7 is buggy, and has some problems, for example, it doesn’t scroll automatically, so you must keep down wheeling the mouse to see the new text. For the rest of you, you can see the problem working in Chrome with the Andrew’s game:
andrewschultz.itch.io/whoah-cubs-woe
I think I failed to report that bug “officially”, although I’ve complained several times in the forum. Anyway I built a template from parchment site to build easily the online version of inform 7 games. You can see in action in the Caleb’s game:
astrobolism.itch.io/moon-goon
I will ask Caleb to make the zip available, so all you can have a proper parchment website for your games at itchio.
Also, Andrew, just put a “Press any key to continue or something.” at the beginning. The “Press any” works even in mobile! so it is not as bad as it seems.
About the frame dimensions inside itchio, you can put whatever big as you want, so people could play well even without the fullscreen. for example, you can try something like 1280 x 700 (that would work nicely even in laptops). Also, don’t forget to activate the scrollbars and the mobile-friendly options. A lot of games work perfectly nice in mobile, but if you don’t switch on that option, itchio put a warning saying “your game is not designed for mobile”.
BUT!!! 1280 of wide would automatically launch landscape mode in mobile, so I recommend to set the wide to no more than 1024. 1024 800 640 are safe dimensions so the game works really FINE in mobile (portrait mode), and they show really nice in desktop too.
Good luck!