One can sure write “east to you” or “more to the east”, but if I'm located in London and you're in Berlin, can I say that you're “easter” than me?
You'd say that one is farther east than you. Works for all directions, therefore:
Example usage in the Wikipedia article about the extreme points of Earth:
East is a direction. Something that is less East or more East has a completely different meaning than what you imply here.
In your case, it is the distance in the direction of East that varies in magnitude. To indicate a greater distance, you use further (I am not sure if @Rimmer meant further, not farther, though even that seems to work). Expressions such as further east and further north are common.
Strictly speaking, East of Northeast is what may be understood to be 'more East' than Northeast, because of the 'degrees East of' increases. In your case this would not apply.
Furthermore, as a general rule, we do not append the comparative suffix -er in a routine manner. If the -er form of the word exists, we use it, else we have to use a modifier like more before it. It will be necessary to check a dictionary in case of doubt than to form an -er word in a matter of fact way. Easter exists as a different word by itself.