Having played most of my life in 800x600 on a 1080p screen, i know the feeling. I'm working on a resolution selector and i'll try to add it. Thanks for letting me know.
Hey, sorry to hear the game didn't run well. Sadly the lowest graphics setting is literally as low as it is possible without changing the resolution. But thanks for checking it out anyway!
That's because on the old versions of the game the default sensitivity in settings was set to 0, which you have to change to be able to move the mouse. It's fixed since update 6.8 or so.