I'll be very honest: it is too dark. Yes, I can see what's happening. Yes, it's clear and readable. But that's not only what you should be worried about. Lightning is THE MOST IMPORTANT THING in narrative art. It's how we perceive the world around us. It's how we feel the scene. If it's done wrong it can wreck the narrative. In my opinion, your pages look flat and boring. For example, the first three panels of the first page are awesome: you can feel the warm of the light in contrast to the cold darkness behind him. The following panels are cold and flat. Unless that's the way you intend to tell the story, to make the reader feel, you should add depth to the lighting.
Scenes, for as dark as they are, should have depth to the lightning. For reference look into some NOIR comics. They are usually dark, with deep black shadows, but still have strong lights. The key to that style is the contrast.
Light draws attention to the important parts of the scene. Our eyes are naturally drawn to light and empty spaces, avoiding dark or detail dense parts.
To answer your question more directly: you should add light to it. But just to some little parts, while mainting the darkness on the most part. Use it to draw attention the the characters faces, to movement, to something you want the reader to notice.
I think you're in the right path. Your comic setting is very interesting. I think adjusting the lightining would make it even more awesome. Good luck and keep up the good work!