Hello, Quelcezot! I've been finished with your game for a while, but I finally found the time to sit down and write up my thoughts.
Let's see...my first impression is that
New Planet is indeed different. Not in a negative way but, rather, it's exactly as you described it. A strange romance, one that piques my interest. In the beginning, the black and white palette, combined with the music and SFX, gave me a sort of foreboding feeling. There's something sad in the absence of color and a stark loneliness that
makes it far more powerful when color returns to the world.
I actually find the second stranger incredibly likable. The narrative's acquainted me with him for all of a few minutes, but he doesn't strike me as a bad guy. For that reason, I prefer the ending in which
Mary accepts his love.
I just personally prefer happier endings.

However, that doesn't mean I disliked the second ending by any means. On the contrary, it leaves me very curious as to what was happening. It felt a little bit like a
Star Trek and
Twilight Zone experience.
To me,
New Planet was much like a feeling piece, artwork meant to inspire emotion and be subject to interpretation. The full screen immediately immerses you in its world, and each transition, every sound, guides you further into it. I can tell you put in a lot of effort as well with the panning of the camera, the customized mouse, and so on. It makes for a very smooth journey that I'm happy to have taken up.
Good luck with your larger project! I'm looking forward to seeing what it is.