I don't find that inevitability scary, purely because it's inevitable. There's no risk of failure (that I saw in game?) and you can't control the outcome, so it actually reduces the fear factor imho.
Given even one or two small choices and suddenly it becomes tense, because you know that if shit goes down now, it's your fault. You have to make a decision, and making decisions is more nerve-wracking than just being told what's going to happen whether you like it or not.
Not that I'm complaining, but I think the game could be improved with just very small things; it doesn't need a big branching segment or anything. The time in the cabin is the best bit because it's up to you to wander around and find out what to do next, to check outside the windows and see how the others are doing. Even though nothing changes the end result, that bit of control creates more atmosphere than just reading a description.
But then again, I'm just a visual/kinetic person, so I'll always go with that choice.
Either way; looks good so far. The atmosphere is done well and the visual management is good. Bit fast-paced, but it doesn't detract from it. Keep it up~