What is it?
Valley of Steel is an interactive fiction (intfic) game. It was written in Inform 7. I wrote it because as a kid I really really enjoyed the Infocom games, and I'd written a short story that I thought might make a fun setting for such a game. I basically used this project to force myself to learn some Inform, and to get myself 'coding' again. I work in technology, and the magic wore off a while back - I figured if I did something for myself, it'd be more fun. I was right.
Can I play it?
Sure! The link at the top of the page is a link to the release page, where you can either download it free of charge or play in a browser. This repo is mostly for me, as it consists of the Inform working directory. If you want the playable game, I strongly encourage you to go to the link at the top of the README, which is the official Inform 'release page.'
Can I use the code?
Yes. This code is available under the MIT License. The only exception is the contents of the Valley of Steel Materials/ subdirectory - those are ALL RIGHTS RESERVED (cover art, any original prose).
Note that the 'code' that you care about is in one text file, available here in the source tree.