Ooh, and it's fully playable!
Last time I tried this game, I think I had managed to get a hold of the original executable or something: the rate of turn for the turret was tied to CPU cycles. Paying it on a computer about a decade younger than the game made it quite impossible to aim, as the turret would spin several laps if you so much as looked at the arrow key
There are some Chess games from that era that tied their difficulty to the CPU speed. Essentially calculate options for 5 seconds or something like that. So as hardware got faster, the games got way more difficult.