2 bits = 4 colors. There are only 4 colors in it - the rest is illusions created by dithering.
The images you posted are from IndieDB which slightly blurred the image, creating more colors by accident. The game's website's images are alot sharper, and has 4 colors (a creamy white, a soft green, a grey-blue, and a off-black).
Personally, I think it looks nice.
"it's a turn based exploration game with some RPG elements where you lead a party of pioneers each with different professions, skills and attributes."
It reminds me of a mix of Oregan Trail and Dragon Warrior - I think it looks like a very cool game! I hope its actual gameplay is fun.