Fortunately, every category includes the "Other" option - any game you feel deserves an award that we've left off the list, please write in. (And don't worry, we'll make sure to resolve any spelling differences so that games get all of the write-ins they deserve.)
On that note - every year, we get a number of write-ins for "None" in categories where someone didn't care to pick any choice. You don't need to do that - no questions are required, so if you don't want to vote for one, you can just leave it blank. :)