What kind of artistic style categorises such paintings? What do you call these kind of painting (attached below)? What is the genre of such art works? I'm absolutely in love with this artistic style, the exaggeratedly tall houses and long trees in some old village, typically depicting a cool season like winter or autumn. It has that bleak yet warm feeling? I don't know how to describe it.

Pertaining to this, what are the techniques used to paint such artworks? Oil painting on canvas or water color on drawing paper?
The artist, Debbie Criswell, calls it Primitive Folk Art.