Echo is one of the best VNs I have ever played. It is not your typical furry VN where there is only sex and relationships. Echo is a real story full of mysteries and secrets. And the music simply perfectly conveys the atmosphere of what is happening on the screen... I think everyone should play this amazing game. This game makes you want to come back again and again until you uncover the story of this city to the end. If you are looking for a VN that is worth playing for the story, then this is the VN for you. Overall, this is an amazing work.
Spoiler:
To clarify, this vn isn’t really a mystery. ECHO’s power is so immense that merely trying to grasp the enigma behind it is far beyond the reach of mortals.
In truth, there isn’t a definite answer to any of this, but that doesn’t mean it’s meaningless. So what if life is nothing more than a vast cycle? You’ll experience pain again and again, but happiness will too.