Geez, this was brutally difficult! In a good way. I was so mad when I was deep into an early run and ran out of ammo! I went into my next playthrough a lot more thoughtful about when I took a shot.
Movement was satisfying. Your level layout and use of lighting made for some really tense moments, keeping me on the edge of my seat the whole time. The art is great. the sfx added to the overall environment. I love you opening cutscene. The comic panel is an efficient and stylish way to set up the story and game.
The art is nice, but I do wish there was a more clear distinction between the stationary enemies and the ones who could roam. I know the roamers had booster flames on them, but that was a tough read in the heat of battle. Even a slightly altered color palette would help.
Overall. Great game. Really enjoyable experience.