nice game! :)
one little thing: why is the options button somewhere in the middle of the screen (i did NOT play in full-screen though...)
Hi there! I noticed this too. If you are using unity, you might want to look into anchors. They allow for repositioning based on game resolution, which may help your case here. Other engines usually have this feature, too.
EDIT: Just realized I misread your comment, I thought you said that you didn't know how to fix it. My bad, sorry!