9:05 is a tiny game, and everyone interested in interactive fiction should play it at least once.
This is true of most of Adam Cadre's IF work, actually: he is interested in the formal limits of interactive fiction design, and that means that even his smallest and least-known work tends to force the player to reassess what games can do.
But to say much more than that about this game would be to spoil the experience -- try it and you'll see.
N.B.: 9:05 was built using the Z-machine, an interactive fiction engine originally created by Infocom. To play the game, you need to install a Z-machine interpreter on your machine, and download the game file. We link to Z-machine interpreters for PC, Mac, and Linux above--you can probably find them for other devices, too.