Pretty good. The title reminded me a bit of Silent Hill, with the gloom and fallen particles, and thus my expectations soared. When the first interface button popped up I must admit they dwindled a bit, the scroll style buttons didn't seem to fit in with the otherwise dark, sleek and minimalistic one. In the game however they were perfect, and that turned out quite different from what I'd expected.
I like the ancient atmosphere, the animated explosions, the simple power-ups, and the controls. It's all simple and captivating, though it felt like it took a looong time before things really started taking off. Also, restarting from where you left off would be nice, since it seems checkpoints don't really match the pace. Keep it going!
-cd-