woah shit look at those rock textures
In all seriousness, it's kinda neat as a prototype, though a lot of seeing if it'll work in action would rely on how the enemies work. Since there's a whole lot of nothing right now, the only thing I can really say on it is to add a screen bob/shake slider. The fog shader thing's kinda cool, though.
Also, a weird bug with the block that lets you attack if you move towards an enemy with your shield up.