Work up the sides through the lower half of the level, and the middle of each row will fall easily. The Spawner Bombs and Sliders are not a threat, so work around them and save any On Fire-power for attacking the root Ice Bubbles. The TNT are also handy used against the root Ice bubbles. Don't try to land them against the ice chain itself however - they will break the ice, but drop immediately.
Ice bubbles; Sliders; Spawner bombs
24, 13, - TNT (2)