There is no friction here, so every thrust lasts until you thrust the other way, and the closer you get to the speed limit the less each push adds. Your ship loses wings, canopy and nozzle one part at a time, each changing how it flies, and black holes are there to slingshot past. Marc Hoag’s homage to Ben Haller’s 1991 After Dark game Lunatic Fringe is free, with no ads or tracking, and everyone flies the same sector each day.