It can't be worse than a walking simulator?
You convinced me, it's time for me to play this game. I'll give myself a week ;)

Game finished.
It wasn't so slow, I expected worse. But yes, the character can't sprint! And I would prefer to sprint with 'shift' instead of crouching...
I didn't have a problem with the achievement for the first level. I'm not sure but maybe you've skipped the intro level.
I replayed the 1st level and it's by far the shortest: around 10 min, if you care about the achievement.
The game ending is kind of funny: we end up at exact position where we started the game in the intro level, but after having released a UFO and nobody noticed anything... Yep, the story could be far better. But there was tiny bits of story when we find secrets, which was a plus.
And the voice acting is bad as well in my language (french).
I give it 6/10 for it's uniqueness :)