Here are redesign of my versions of 13 & 14: 13: it activates it's burners and comes crashing down from the top of the screen, then it turns them off and starts shooting fireballs you need to avoid in order to keep your temperature low. 14: chooses random spots on the board to freeze so they cannot be opened for a short time, also they try to freeze your mouse from time to time so you must avoid the ice spells to keep your temperature high. These two are 2 sides of the same coin, and work well alone but great together. In 14's phase 2 they summon 13, where on raises your temperature and the other decreases it so you need to balance between both.
Their respective levels are "THE DEVIL'S PIT" and "THE DEVIL'S GLACIER" Music used: true boss 11/demonic little gray cat