Hey so I've never said anything on this forum yet, but I wanted to say something about the raiders here.
First I wanted to thank Mr Walmsey for making this game, which scratches a very particular itch of mine, I love it so much.
That said, I do agree the raiders are a little broken.
At the moment, the practical difficulty of the raiders is, really, tied to the number of NPRs in your game (assuming you set it so that NPRs encounter them too, which I imagine most do). The more NPRs, the more places for them to spawn (which aren't in your home system), and the less likely you'll encounter them.
I'm not exactly aware of how difficult this would be, but would it honestly be that hard to just include a difficulty setting during game parameters to control the % chance of a raider spawning?
In a game which already has severe problems with accessibility to new players, I'd imagine something like this would be very important