I'm not sure if you'd call this a very short rpg, a tool or a gamebook, but it's a neat idea so I thought I'd mention it.
The game is called Seedship and the start page is here.
The basic idea is that you have a colonization seed ship and have to found a colony of people escaping from the earth.
The game ends when you found your colony, however since the planets are randomly generated and you never know what you'll find, whether your colony is successful can be interesting, especially since you don't always know how good your ship's systems will be through the ware and tare of space travel.
The game is entirely text based with no sound, but entirely accessible since it just has links.
Apparently it was created in a game creation language called twine which I think is somewhat similar to choice script, though from what I gather Seedship uses far more stats, random generation and such to make it more of an rpg and less of a straight gamebbook.
What is particularly cool is that you can keep a log of past missions and see how good your colonies are, well as long as you don't delete cookies etc.
While not a long game, this could be fun a quick burst, and I can say I do like the writing and the choices.
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)