A currently in-Alpha Sandbox,Level-editor,Brawler and Parkour game, where the enviroment is your most effective weapon and the factor that usually determines your survival. (And no I don't mean that the Earth just engulfs your enemies when you're about to die)
The fighting is fast paced and based on a sort of skeletal structure, which means if you get hard enough, somethings going to break. IE. Throwing someone over your shoulder and it just so happens they land on their neck and it kills them, or you boot some poor soul hard enough you send him flying into a wall to have his spine broken and then he is paralyzed and no longer a problem.
The parkour, from what I've seen and is very fast paced, wall jumping, wall running, leaping great distances, this allows people to make very interesting and huge maps that require you to be a skilled ninja rabbit (Unlike me because I usually make my rabbits 8 feet tall and obese, so I can use that as an excuse as to why I can't parkour to even save my life) to succeed in such levels.
Speaking of creating very intense parkour levels and such, The Level editor is great for allowing you to, as I stated above to create interesting and unique levels whether it be a large scale battle with swords and spears or an intense ninja parkour challenge, or both, you are able to create it, and if you are too lazy to build an interesting map or the base game materials aren't enough for you, theres a program created for modding the game known as the SUMLauncher(Supported by the Devs themselves) which instantly downloads and places the files in the correct areas so you can use them with no hassle of moving the files yourself, this program has lots of user created mods that range from maps to characters to props.
However the game is still in Alpha and if you're not the person to purhase early and follow a games progress untill its finished then perhaps wait until the game is finished as it is very worth it already in its current state, and I recommend getting it early and watching it grow and develop.