This vertical section is dominated by Bone Pillars, which shoot fireballs. They are stationary, so you can often whip their heads from a safe distance. However, they are often placed in tricky spots, requiring you to jump and whip simultaneously. Skeletons also appear, throwing bones in an arc. These can be tricky to dodge. The Cross sub-weapon is excellent here, as it flies across the screen, hitting multiple enemies. There are many stairs in this area, making it easy to get cornered. Always clear enemies from above or below before committing to a climb. Watch out for more Medusa Heads as you ascend. A hidden Pot Roast can often be found near the top of the tower, providing much-needed health before the boss.
