you could keep all that data in an array, and then it is a single structure to save and load from local storage.
that would also let you expand the data stored - you could keep the top 10 best scores for each game type, save the date, user name. etc... and still only need one get and set.
EDIT: also, you don't need to check if key exists and then get it. checking returns the value stored if it does exist.
EDIT2: it also looks like you are checking local storage every single tick - 60 times a second. you really only need to read local storage at the start, and then save at then end of a game if the score is greater than then last high score. (although I can't tell for sure how your code is structured based on that image)