I too found it hard as a teen. It was the first game that I found to force mouse aiming in an FPS. Replaying it now, I can use keyboard only, even the default controls. But it’s clearly meant for mouse.
Still, a great game for the era. I think it’s far more than a tech demo. If anything Doom, Quake, and Descent felt more like demos; with their nonsensical and disjointed levels. FS and Skynet have story (if you read/watch it), level continuity, characters, objectives, puzzles, relatable environments, and variety in movement. IMO it was ahead of its time and holds up for anyone with a bit of patience.
