Just a couple of things. I won't address the save issue or others that everyone seem to have noted.
So... it runs terribly slow. I know that I have a potato laptop, but I can run Stardew Valley (and most anything made before 2015) at 30+ FPS. This game crawls into the 10's when in the reactor room, and single digits when surrounded by rocks on a planet.
Also, which the pixel stretching, it doesn't control well in fullscreen. Mouse position doesn't match the entity being selected.