Place the heatmap of price and rating on the main tab
add bottle name into the tooltip for the heatmap
Be consistent with naming your variables ex. using 'Points' and 'Ratings'
Number of reviews on the first tab could be changed to 'popularity of wine' (explanatory subtitle stating that you are using number of reviews as a proxy of popularity)
Add null value to the USA map
Add a short description under wine rankings
Change number of observations to 'number of ranked observations', or better yet make it dynamic!