I've never done this, but a possible solution could be to try and change your resolution manually;
Go to the Folder/directory you've installed the Game in.
Go to, "element" folder, then go to the "userdata" folder,
then click on the "systemsettings" ..
scroll down, and find and change the following values.
RenderWid = 1255 (change it to what ever you desire)
RenderHei = 687 (change it to what ever you desire)
FullScreen = 0 ( change it to 1, if you'd like to play in your desired resolution with full screen.)
WideScreen = 1 (can also try with 0 aswell, see if that makes any difference)
..... i have no idea if this will work or not lol, never tried it, but theoretically, it should work o.o