Mad Max comparisons aren't apt at all; this is quite a different -- and likely more realistic -- take on post-apocalyptic "society," a Hobbesian dystopia of scarcity and privation. The plot, as the title indicates, concerns an elemental, Darwinian struggle to survive amidst zero-sum competition for virtually non-existent resources.
There's no room for inessentials like unnecessary dialogue (and there may not even be a score - certainly, I wan't aware of any incidental music) here. It's a reflection of spare, lean world in which nothing is wasted. Food and sex have a price, but trust is beyond calculation.
Very well done, I thought.
I watched this last night on Netflix, and enjoyed it. I had a few nit-picky moments with it, and didn't really like the ending, but there you go. It was a decent enough way to pass the time while B was out at a poetry class.
I also enjoyed, and was surprised by the fact, that it's an Irish film, and I didn't have to put up with a bunch of bullshit American bravado and machismo, which most post-apocalyptic films tend to trade in.