Original War is an older game that I've never heard of until I saw it on Steam and, on a whim, decided to buy, and it quickly became one of my favorite RPGs ever. It is colored by the idea that you have limited resources. Think of any classic RTS, except you play it like Fire Emblem. That is to say, you can't make any new units. Your human troops can be assigned different jobs based on what you need them to do and the longer they do it the better they get. Actually I lied a little, in that later on you can build custom built robot units to do the dirty work so that you don't have to risk your people directly, but it takes a person to operate them remotely, just like a UAV, so people never stop being a valuable resource and you will always be jealously guarding their lives.
There are a couple alternate endings but, though this game has no sequel and thus no need for a canonical ending, none of them actually happen at the end of the game, so they're more like a bonus if you decide to take the treacherous path, but I respect the fact that the game does more than pay lip service to your choices by actually acting out the consequences for you in-game and in cutscenes. Not to mention the campaign has a huge branching path full of choices for you to make. I'm fairly sure that there are even missions that you have to play the game multiple times to experience, but I'm still only on my first playthrough because I've been spending so much time going back and trying different choices, as well as trying to complete optional objectives to see how they influence future missions.
Another huge thing is that in the campaign missions, almost all of the human units have their own dialogue. Even in Fire Emblem there are mooks here and there, but not in Original War. Everybody's got a name, a job, and a personality. It's amazing I tell you.
I haven't even gotten to the premise. You're an American soldier who is part of a special force assigned to go back to prehistoric times to seize this priceless mineral before those dirty Communists even exist, and move it to America for it to be discovered two million years in the future. Did I also mention that you can teach ape men to use M16s? Be careful with them though. Ugg could be your great-great-great-grandfather!