Mecha Ace is all about being a Mech pilot fighting for the rebellion against an evil empire. Sounds like a fairly standard setup but the actual missions and choices in the novel are fantastic. I loved this author's work and I need to find out if he's written any other interactive fiction that's been put out through Choice of Games.
I really like finding good ones put out under the Choice of Games label, but honestly the hardest part is finding a good author and then finding their other content. It gets buried under the general catch all label too often.
Anyway, Mecha Ace is really good, so if you're into interactive fiction or have ever enjoyed a choose your own adventure game you should give it a shot. You can read/play it on many platforms if you click through here.