What I have always thought is, if you try to "match" an existing floor it looks like you tried and missed. When you go with something completely different, the result is yes, I wanted something different, and here it is. Especially if you lay it in a different direction. Does that make sense?

Is the house on a slab or is it raised? Wood throughout is always a gorgeous pop of color since you are leaning toward a light wall color. Here are a couple of examples of light walls with various collections we offer. The flooring comes unfinished so it is a great canvas if you wish to create a custom look!

You could do a black paint trim over the wooden bits. It would go with the work tops. But not so much with the creamy doors; Or get all of the kitchen units spray painted white? I think if you try to match the floor with the wood of the units in the kitchen you may leave yourself open to a mismatch or even just an overload of wood. I didn't feel there was enough black there as the island top kind of took me by surprise on first seeing it. But could you remove that granite altogether and see how it looks then? Maybe it's the black that's the problem not the wood at all

I disagree. This is standard whitewood T&G flooring. It's generally laid across joists by builders on the first floor of two storey houses as a cheap subfloor ready to take a floor finish. I've seen it sanded and varnished / stained and while it looks OK for a few months, it doesn't wear well as it's a (very) soft wood and is very noisy, particularly in the rooms under. If you want a wood finish without breaking the bank, there are some good laminates that you can lay over the T&G boards. A semi-engineered board would be better but will cost a bit more.