I cannot honestly say that this game took me all by surprise, because I had heard it was good long before I got the opportunity to play it. But I was still surprised to see it live up to all my expectations, and beyond.
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Primordia is *very* good. Not only has it great setting, characters (with some really nice voice acting), cool and logical puzzles, unique art style and music that puts you right in the mood, but is also masterfully made in such a way that all this fits together creates a greater whole, various elements complementing each other to make something truly exceptional.
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You will not find the puzzle/plot distinction here. Aside from the occasional cutscenes, puzzles just *are* the plot and serve both to present you a challenge and immerse you into the world even further. And it is the kind of world I willingly wanted to be immersed into. It is post-apocalyptic in the best sense of this phrase (think Fallout or Mad Max 2) - bleak and depressing at times, but not afraid to throw a mood-enlightening joke now and again.
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tl;dr - If you like adventures games at all, you will love Primordia. Great game, although I wouldn't mind it being a little longer.