the commander looks uncomfortably similar to Jill Valentine and the science officer is probably gonna bleach her hair
well, jill is simply the stereotype of woman-in-arms if you ask me. She looks like Lara Croft in G.I. outfits

now, given that your #3 is the "mission commander", i guess you could just drop her beret, give her something that looks more like an officer suit and a more rigorous hairstyle (/me think of Cpt Catherine Janeway in Voyager, for instance).
One thing I hate is when it takes a half-hour of reading text to get to the actual game.

i know what you mean. Your teaser video somehow suffers from this. ~15 seconds of text to learn that your mates are trapped in a closet and that "those creatures" that haven't been seen yet in the game are everywhere ... Just a "mayday" call interrupted and a bleep on a "scanner" device of the HUD would give the player a good feeling of why he's moving ahead (imho), and having your commander saying "beware, those things are everywhere" would be more fun *after* you had a good fight with the things

but well, it's a pixel forum, so .. maybe just make the Science Officer being smaller or taller than the Mission commander and changing her hair colour would break that similarity they have right now.
<edit> Oh, and i showed your sword slash anims to a friend of mine who practice escrime, and he found virtual nothing to criticize on your sword moves (which means, trust me, that you did a stunning job,knowing the guy) but he pointed out that your characters had surprisingly short neck and that the head is moved forwards. For the commander girl, you might give her a more "martial" look by just making her stand straight, insisting on her neck that separate her from her troops.