Great Game with good graphics! It might not be Tomb Raider like, but it is a fun hack 'n slash / puzzle
Co-op mode is not yet available, but it will be made possible via an update sometime in September as far as I've read! Then is will be re-playable and fun once again!
Moreover, there are certain in-game achievements that a players can attain and therefore it is real fun trying to replay a level after having completed it, in order to get more skulls, improve your time of completion, find a secret location that you might have missed etc.
The soundtrack is also great and it is really rare that you find such good music in an arcade game nowadays! So I propose that you download the demo to check the game out yourself, and after that I am sure that most people will go ahead and buy it! It is a great game!!