I'm not trying to convince you, far from it , but the scene in the demo is far from the best part of the game.
It's simply a moment that doesn’t reveal too much. The story is the real strength of the game, and I think that’s why it’s been so appreciated.
Even revealing a tiny piece of it would ruin all the suspense.
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If you felt the demo was too short, that’s actually a good sign . it means time flew by :p
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Spending $20 for a story over 8 hours long, created by a single person working 4 hours a day for 2 years... doesn't seem too expensive to me.
Anyway, you might be missing out on a story you'd really love, just because of bad past experiences. That would be a shame :p
In any case, have a great day :)