It's always the time that ends up running out :)
Are the creatures those little spike things?
To bring out the theme a little more and give the game a little challange. There could be birds (pigeons, gulls) which appear and destroy the fields. They fly away as soon you get too close to them. Just a little idea that came in my mind :)
I often realese a little hotfix and add a few little features for my games after the voting ended.
But I also think it's good to leave the game as it is and focus on other projects.