I've been playing KHux on my iPad Air 2 for over a week now.

But as I am progressing, I am finding the enemy difficulty is outclassing my character's survivalbility.

I have unlocked level 114 (enemy level 35).
My character's level is 44.

Since I don't want to keep spending my jewels on Continues, I need some clarification of how levelling up improves your character.
Because from casual observation, it doesn't appear to do so.