Squad's sandbox space exploration game, Kerbal Space Program, is about constructing space-worthy vehicles and exploring the stars. Thanks to a healthy modding community, it's also about blowing things up with lasers. Yay, modding community!
Give humanity the tools to better itself, and it builds better weapons. While Kerbal Space Program only joined Steam's Early Access program earlier this year, fans have been having a field day with the game for ages now, using the space-themed toy box to create some pretty amazing things -- like space basketball.