Panels 5-7, and the last one are a bit hard to read for me. And the light in the first 3 is a bit distracting. Keep in mind that areas of high contrast attract the eye, which is good in panel 11, but not so good in the first 3 panels.
The way you've used ambient lighting in panels 8-13 is really nice, but it's still a little bit hard to read on the whole. Keep in mind, your goal should be to make it clear what's going on.
What I would do is raise the value of the characters in general, and lower the value of the background. This will make it so it's still clearly a dark environment, but the characters won't get lost.