I'm a little iffy about the idea of a single choice jam. I personally feel that having a single choice in an IF game is kind of restrictive and takes away the fun. Still, this game provides another interesting take on the single choice idea.
You receive a message, informing you of the end of everything. You have one final chance to say your goodbyes. The message (and the overall writing in the game) was actually pretty strong, and moved me and got me thinking. I'm trying not to spoil too many details here, but go ahead and play the game for yourself.
Your single choice here is an open text option where you can type in something and say your goodbyes. Gameplay wise, it is sort of like Home from the Neo Twiny Jam. There are multiple fields in the form, with a pretty omnious timer on top. Write whatever you want. (As with Home, well... nothing is stopping you from typing something like 'giddafsdahjgfjw'. Another note, the game won't let you proceed if you leave the fields blank.) That said, if you let the timer run out without typing anything, it just shows a blank output on the next page. An alternate ending would have been cool.
It's a short bit of strong writing, so go ahead and give this a try.