I made these illustrations detailing all of the game's Creeps. The left column shows the basic types; the more you deploy waves of the basic Creeps, eventually they'll level up and unlock a more advanced Creep for you to use, shown on the right.
Just like the Towers, all Creeps have their own particularities--some are strong and slow, others are balanced, still others excel at evading cannon fire. You'll need a good mix to outwit your opponent.
Thanks again to everyone who showed interest in FWF. If you haven't seen yet, please check out this video detailing the current demo version to get an idea of the game flow. Thanks for reading!