I finally finished it !
It was just awesome ! One of the greatest games of Kojima with Snatcher and MGS2.
Compared to Snatcher, it's hard to tell which one is the greatest, I prefer the cyberpunk theme of Snatcher, but I also like the theme of Policenauts, and the story is more developed in Policenauts, moreover, Policenauts is so much longer than Snatcher, and I love that.
If only Kojima had released Snatcher with its six chapters !
And I almost forgot, the translation is just perfect, I'm French and I'm used to bad translations of video games from English to French...well, I don't speak Japanese, but I think this translation is better than the usual thing, and its implementation in the game must be some hard work, thank you to all the guys behind this.
It's so great to play a game with the original Japanese voiceover, I don't understand why we can't have this for all Japanese games released in Europe and USA, there's so much people who would like to have that...