Actually, you were close. I had to stasis the guy I couldn't kill and take care of all the little guys that were with it before the door would unlock and I could haul ass.
Anyway, I'm part-way through Chapter 6 now and I can firmly say that my original perceptions of the game were pretty much correct. This game is not psychological horror by any stretch of the imagination, Dead Space is "oh god, there's a hideous, malformed alien trying to hack me to pieces kill it kill it kill it" horror. As such, I've seen a lot of 'serious' horror fans turning up their nose at it, and all I can say is that they're missing out. This game is far from the most original game in the world, it's pretty clear they just took Resident Evil 4's gameplay and then bit off as much of the Bio/System Shock environmental and thematic stuff as they could. However, it's executed so well from a graphical and gameplay perspective that it really just doesn't matter that much.
Various tips from my experience so far:
- Don't bother buying ammo, the game is pretty generous with doling it out. The real problem with regards to conservation is inventory space, as you will find between health, air, and stasis packs along with ammo for each of your four weapons, and various other items that take up space, you'll never have enough room so that you really feel 'safe'.
- Early on, when you usually only fight one or two enemies at a time, you might not see the point in using stasis on enemies, but it will be a goddamn lifesaver when the game throws a bunch of enemies at you at once later in the game.
- Right now, my weapons are the Plasma Cutter, Line Gun, Force Gun, and the Ripper. The Line Gun is probably my favorite weapon so far, it's powerful and the projectile is large and easy to aim. The only problem is, you get ammo in really small amounts (2 per drop, 6 per stack), so you can't rely on it too much. I'll probably swap out the Ripper for the Contact Beam once I get the achievement for killing 30 enemies with it.
- I really haven't found much use for the Pulse Rifle beyond taking out the swarms of tiny guys that try to jump on you; it just isn't accurate enough to sever limbs effectively. Also, the flamethrower fucking sucks, don't even bother with it.
- Unless you're running low on health packs (so far, I haven't had much of a problem with that) or need to buy a new weapon, you should be spending all of your money on power nodes for your equipment. The game is pretty good about giving you just about everything else in the environment. Also, always keep a node or two on hand instead of using them all for upgrades right away: some locked doors can be opened with them, and those areas usually contain a lot of loot, which would cost much more than the credits to buy another node anyway.