Dark images. Faulty camera?

Hi! This is my first Instax, it was a Christmas present. I know how to use a DSLR but never used this style of cameras.

I've done a few photos and almost all came really dark. First pictures were on night, so I guess this cameras can't shot at night, but ive just take one at 3 pm on south Spain and came dark too!

Am I doing something bad? (On the third picture you can see how there are parts that are almost pire black and also burned whites)