LOVED the concept, by all means. It was not clear in the beginning, but it's a great multiplayer concept. My only take is that the graphics can be improved a lot. Try to use icons for weapons and blocks, but keep the focus on nicer (yet still 3D) graphics on the characters and animations.
Reference puzzle RPG games like Puzzle and Dragons, and Horde of Heroes for separating the puzzle and the animation yet keeping them relevant.
Finally, the selection of activity (shoot, block, etc...) can be improved, especially if you'd like (and you should) minimize the controls.
Amazing job, really.