Bland....
1 : the character
His/her bones seem to be out of place.
The run animation has way to little weight to it. It makes me think of the doom marine.
Holding a weapon seems to be a weird concept for him/her. Its being held like a dinner plate.
I could only see it was a weapon after the lift closeup.
2 : the level / environment
Were is the bridge suspended on (except for the 6 cables on the beginning)?
The flat graphics is something I don't mind, that was your choice.
Things like the computer screens could have some animation when the person is pressing the buttons.
Overall this makes me thing of mindjack.
There is no weight to anything and it looks so dull.
Try better next time, you'll get it right.