When I think 'Mercenary', I think along the lines of the only game I know of with that theme - Mercenaries 2: World in Flames. A bunch of hardened former military folk blowing everything up because it's all part of the job; something like that. This is Mercenary though, which is quite different and much older.
You're not a gruff mercenary in the same sense, but you can certainly make use of your ships weaponry against the locals, be they on the other side or on your side and in your way - it doesn't matter, you just want to get off the planet you've crash landed on, which means I've got to crash land and see what this game has in store.