Er, Spacewars (computer game) basically just pits 2 starfight against each other. You control the angle of rotation of the ship and the speed/velocity. There’s even a niffy feature where you can hyperjump - your ship breaks into tiny pieces and reassemble at another location.
That all said, anyone has any ideas where I could find modern clones of this games? It doesn’t need to be explictly a “spacewars clone” as long as the game somehow resemblances it.