Is there, or can there be, a download version, for offline play?
Unfortunately itch.io's webpage does not allow the playable file to be downloaded (I have no control over it) but it can be downloaded through itch.io by using the itch.io's app. If you prefer to not use the itch.io app to download, you can easily download the game through my discord server or go to my FA account, sofurry account, weasyl account, pillowfort account, or blogspot account which will have a dropbox file link and a mega file link to download the game when you view the game's submission post. (And it's also available to patrons/subscribers on my Patreon and subscribestar.)
This is a very late reply, but you can also download browser-playable games from Itch by right-clicking them, selecting "show only this frame," and in the tab your browser opens by either right click -> saving it or hitting ctrl-s.
Since this was made in Twine, you can then drag it into the Twine editor to poke around inside if you'd like!