Hey, thanks for the feedback! Did you try the third-person view by holding right-click? It makes the marble a lot easier to track. :)
To get your cursor back, press "F" for the pause/main menu. We removed it in-game because you're orbiting the marble the whole time, so the cursor would just sit frozen in the middle of the screen.
The fog and marble size are intentional, they're part of the look and challenge we were going for.