I fully recomend this game. It's simply an SDK 2007 mod, utilizing Half-Life 2 assets to tell a story, but it's an amazing interactive experience. To anyone, install Steam, and get this. It's absolutely free to anyone who has the SDK 2007 engine, which should be pretty much everyone.
I already got the six endings. It's not an action game, it's simply a choice game with a delightful story. I recomend doing all of the things you're told in the first run, then experimenting with it. It's fun.