Edge of Space, a very interesting looking 2D sandbox survival game has just been released on Steam today. A game just might pique your interest.
The fascinating part is that it's all in 2D, a perspective usually reserved for side-scrolling adventures. Or certainly not of the sandbox open-world variety. Even isometric RPG's and other top-down 2D representations of an open-world are relatively limited in how you can approach them, so this one looks quite compelling.
It's currently $10.94 on Steam with a 27% discount. Quite frankly, despite the mixed reviews, the premise is different and could turn out to be a truly engaging game.