Destroy rascally missiles n' bombs with incredibly powerful countermeasures: balloons! Balloons 'splode enemies on impact, but not only that, each different color balloon has a unique special ability.
You play Recty, a sentient rectangle with an incredible ability to spawn balloons ad infinitum. Recty hates missiles n' bombs and likes to 'splode as many as possible all the time. It's literally all he ever does.
Leaves behind a fireball. If an enemy hits the fireball, they 'splode. If the fireball an enemy hits was directly created by a balloon, that enemy leaves behind another fireball.
Pops into several smaller balloons that can each 'splode more enemies. The direction and velocity of the cluster is affected by the original balloon.
Leaves behind a ball of electricity that stuns enemies on impact.
Leaves behind a set of vines that grow randomly. Enemies that enter the vines are slowed.
Leaves behind a giant ice cube that slowly melts. Any enemy that hits it (you guessed it) 'splodes. It melts faster when it 'splodes 'em.