AquaNox is one of the best games I've played. Not a very strong story, ♥♥♥♥ty graphics for 2014, I'll give you that. But the amount of customization for the time it was released, the amount of different enemies and the freedom you had was really new for its time.
It's a masterpiece, just like Myst, just like Jak and Daxter, even if this game, AquaNox, is not so widely known. The mechanics work wonders.
Only a side note: If you have a high DPI mouse, be sure to set it on lower values, or try to get a patch for it, otherwise the game will go crazy with your mouse speed.
Great game: 7.5/10. Would buy it again (and so did I, I bought it the first time long before Steam was even a dream...)
Worth: 10 dollars.