I don't think I would say this is a RomCom, it's a heart-warming, thoughtful film that really needs to be watched twice over.
It's got some of the oddness that reminds me of Monty Python sketches, some quirkiness that makes it stand out and feel fresh, romance and proper funny bits, and it's got a great soundtrack.
So it's probably going to appeal to Brits more than to Americans, but take that and enjoy it.