Hello :)
Stickers are little phrases or title, you would like to hand out in recognition of a thing that particular game did well (if you have ever voted during the SpringThing, they are similar to the ribbons). It can be also used for quirky impression as well. In the voting form, we included Most Heartwarming or Best Use of a Squid as examples.
The Allow response editing option in the Google form is enabled, so you can always come back and edit your judgement even after you've submitted your vote.