nice stuff!
looks to be a tad of a dark-scifi genre, which I automatically love :P
I really like the use of greys and blacks to make the characters stand out against the background, it gives a lot of depth to each shot. gotta try that myself at some point.
the action poses, especially the last page, are on point. That final shot is an epic dynamic pose and you've got it spot on.
if I had to suggest anything, maybe sound effects? like a "thunk" for the handle being pushed etc. I find sound effects really add to the depth of a manga really well.
keep it up, can't wait to read more!