Slightly Different

Stick movies always have more violence than that, but at least your frame-by-frame animation wasn't too crappy. File size needs shrinking and there has to be more content than that.

Right now, I think you might need more than this to keep any of your animations on NG. This one's coloring is just too plain.

Character Development Needed

Your characters need knees and a more fluid walk. That stick figure moved like he was constipated. Stiff and jerky do not an animation make.

Overdetailed?

Not bad for 3D animation, but you should cut down on how much you put into it. I don't know anything about file sizes for 3D animations, but if your next flash needs that, you'll have to cut down on details to get the flash into an acceptable size and still have something NG-worthy. If these 3 things take 1.3 MB and it's only a total of 32 frames, then there's going to be trouble later on. You could compress some of the things into one object (like the turret legs) and other parts that wouldn't be too noticeable when the object is moved.

Balance, balance, balance.

At Sector 3: Difficulty 6 now and it seems like every time I open a door, there's a zombie to poison me. I'm fine with there being poison, but there's just too much of it and even with 250 armor points and x2 armor, I'm taking 9% damage each second for 20 seconds. There aren't enough armor packs going around for me to cover that kind of damage, especially if the spitters are right in front of the entry door to return the poison timer back to 100%. There's just no dodging them.

And it's painfully repetitive. The enemies can all be taken out just by running circles around the room with scatter shot.

Don't make a sequel with this game's mechanics.

Very little variety to the enemies and they all follow the same tactic of spawn and rush, which can be easily abused by just hiding behind a bed or non-wall object and just shooting at them with the pistol. I think that some of them actually got stuck in the wall because one entire rushing group disappeared after I ran to the start of the level.
The atmosphere of the game works visually, but that's about it. The station is dead silent and hardly eerie. Find some music and ambient noise (like the crackle of broken wiring, the crunch of bones, etc.) to add to the overall effect.
The music suited the action, but the Benny Hill theme would have been perfect considering how the AI act. All I have to do is backpedal and shoot, backpedal and shoot. But parts of the track needed to change. Every time it reached a certain part, I kept thinking that there were monsters skittering around.
And that is just a pain in the arse, more so when the monsters make absolutely no noise. When those smaller monsters land, I expected to hear skittering once they started moving and heavier sounds for the larger creatures. I get nothing, only the screaming of my character once she's being chewed up by 10 or so enemies that hid in the dark spots. I think that's the only useful sound throughout the entire game and it's already too late to react.
It's a good thing the healing station has no limit because I visited it at least 3 times per level. Being forced to backtrack for something like that is a real waste of time, especially since there's no replayability or useful things to come across as you backtrack.
There are moments that are just too predictable too. Lots of ammo, health, etc. at one point definitely means something big is coming your way. This is especially true during the "Boss" fight where I can clearly see what's going to kill it. Hardly exciting.
And like everyone else, that flashlight is crap. I can deal with the battery power, but when the human race is advanced enough to go into space and create aliens for military purposes, they damn well better have the tech to make a flashlight that could illuminate a lot more than just 5 feet in front of the user.

Needs...

Shape variation for wheel and board, colors for all objects (adjustable by sliders, not by type), respawnable and destroyable objects, you to get on the internet and look around for other designs, reasons for users to construct their own virtual skateboards.