You should buy this before getting Edge Of Space, its a Sci-Fi 2D Sandbox like Edge of space, but less Complex, and more fighting, it will get you ready

A Great 2D Sandbox to start out with, it will get you used to the fighting and build skills needed in other 2D Sandboxes fast.

Great game, more calm than other 2D sandboxes like Terraria Or Starbound. It has more storyline and a great game to play after a long day

Spelunky is a great challenge to get used to the controls of edge of space, how platforming works.