Yesterday I used Twine to prototype a small part of the game I'm working on. As part of that I added a tiny bit of css to make it fit better on a phone - https://gist.github.com/Verdi/6ed68f3d4b891ec69402dffc9dbedac8 and I created a Bandersnatch-like timer https://gist.github.com/Verdi/c04f379322fbcd789767e57f92af957f
Check them out if you make things with Twine. And see it in action with my little prototype https://dreamhouse.forsale/test/