What do you get when you combine No Man's Sky with good old Mario? Well, you get No Mario's Sky, a cute little game made in 72 hours in the Ludum Dare 36 competition.
The game is downloadable for Windows, Mac OS X and Linux over at ASMB Games, and let's you explore two dimensional, yet still round planets that you travel to in your space ship.
As you would expect "No Mario's Sky is a game about exploration and survival in an infinite procedurally-generated universe", and since it's free you don't need to worry about getting a refund.