This game and the currently available demo really deserve their own thread. First announced ten years ago for PS3 is now looking on track for a release this year on the PS4. This week an "Alpha demo" was published on PSN which can be played until May 9th, I believe.
Structurally the game borrows a great deal from Dark Souls, but the combat is a lot more technical and punishing, drawing from Team Ninja's heritage of combo-heavy, blistering action games. You wash up on shore and immediately find a sword and a shrine which acts like your Bonfire. You collect Amarita which you spend to level by defeating enemies, but there's also a major random loot system. Since you're essentially naked at first just killing one or two guys in a single life can be progress as long as you're finding new armor and weapons.
Ki is the game's stamina and managing it is incredibly important. Unlike Souls games running out bends you over, huffing for breath. You can also see enemy Ki levels and if they deplete their bar fully it's possible to get in a special execute move. Attacking, dodging and blocking all take Ki so it's important to be careful not to overextend yourself, but there is also a system called Ki Pulse where you hit R1 after finishing an attack combo to instantly regain most of your Ki. You also have multiple weapon stances and you can recover even more Ki is you switch between stance to link combos together.
A few tips for people trying out the demo:
Look everywhere and smash boxes. They can drop items to repair your weapons and armor.
Use rocks to draw out enemies one by one at first.
When upgrading your stats be careful. They do not translate to Souls stats of the same name. Different weapons types scale with different stats. and Stamina is for equipment weight, not Ki. Heart=Katana, Strength=Axe/Hammer and Skill=Spear. Spirit unlocks buffs from your Animal Protector Ghost thing.
Offer all your junk gear to the Shrine. You don't just get exp, you'll also get additional healing items, arrows and other very valuable items.
Don't forget to unlock new moves and skills. Some of the combos will be hugely helpful.
Elemental magic buffs for your weapon are very helpful.