Giving a numerical score to a film like this is very difficult because it depends entirely upon what you want from a film like this. As a piece of art this film is a 10 out of 10. The use of a 16mm clockwork camera, bold editing, dubbed dialogue and hand-processing of the film all serve to enhance the themes of the film perfectly (miscommunication, old vs new ways of life, conflict between classes, gentle aggression of gentrification).
Having said that, if you are looking for a film that captivates you with story and plot, look elsewhere. There is a plot and but it serves as something through which to display the technical aspects of the film itself.
It reminded me of short stories by people like Raymond Carver and Flannery O'Connor: there is a lot to chew on but most of the fat lays beneath the surface, as such the film doesn't hold your hand and if you don't tend to consider the technical aspects of film making when sitting down to watch a film, then this probably isn't for you.
I have given this film a 7/10 because I think that is the closest approximation I can give it but pieces of work like Bait serve to further emphasise how reductive rating films numerically is. If you enjoy films that tell low-key, theme rich but action light plots and focus on the technical craft of film-making then I think you will enjoy this. It's only 89 minutes long and there are no other films being made right now like it.
Oh, one titbit, if you aren't accustomed to the Cornish accent, I recommend subtitles if available. Even for UK natives some characters accents may prove too thick to catch every word.