I haven't seen it yet, so I can't say anything, but someone described it like this: For fans of the Spanish "quinqui" genre, here's a "neoquinqui" gem.

Hyper-realistic, disturbing, and to be watched in one breath.

A journey into the hell of Alicante with its devils. Criando Ratas - Película Completa

PS but what does quinqui mean?