No, I would not switch out the flooring. The AO tile is not cream, it's a warm white. The difference may be subtle but an offwhite/white color scheme is beautiful if planned from the beginning and is rather difficult to do well and not look like you got a bargain on mix and match fixtures and tile. Go the distance with your original plans and it will all be fine. If anything I might consider going with a different color than ultra-white on the walls. Maybe a soft grey or sage green or aqua or something.

I currently have creamy white upper cabinets ,two 36"wide uppers have glass doors on either side of my corner sink. ( (Yes I love my corner sink) The lowers are dark stained birch. I have creamy white travertine look porcelain floor tile and St Cecilia granite which has a lot of orangish flecks so I painted my BS pumpkin. I did this house as a flip; we're living in it while we build The House. I picked the two color cabinets because the kitchen has two north facing windows and needed light, and it's smallish at 12X16. I wanted a white kitchen but couldn't convince my DH so we compromised. White on top, stained on bottom. Funny thing is everyone who comes here loves this kitchen! From friends and family to strangers who step in the door, to the plumber to the appliance repairman. All comment positively. So I'm doing a combo in the new house.

Some whites and creams go beautifully together. Some combinations just look dirty and muddy - this I know from a disappointing experience in my bedroom! Our kitchen cabs are creamy, and we painted the whole room, except the ceiling to match, including doors in the room, trim, walls, windows and had blinds made to match. Like you, I was worried about the rest of the house trim and doors, which is white. But it's absolutely no problem at all. It doesn't look weird, liked I feared it might. Maybe it's because the whole room is basically the same colour. If you do a search, I think you'll find old threads on this subject.

We have a small galley kitchen. Eleven years ago we installed quartersawn oak cabinets, the lowers stained chestnut and the uppers stained sand - an off white. I still love it and left the cabinet scheme when we had to refresh some elements about four years ago. I agree that you should use ubatuba on both perimeter and island. At first I wondered if your backsplash tile was too muddy and 'fancy' for lack of a better word but with your ubatuba, I liked it better the longer I looked at the combination. You get so many opinions - including mine! Have you talked to a tiler about the backsplash installation - they'll require a skilled installer I would think.