Yes. I wouldn't put any more into icy.
before you put more points into a skill make sure you have enough mana to spam it. So depending if you are fighting a tougher enemy or not, I start off with elemental boon to beef up my ice damage, then ice prison the champion or boss. Or if I am surrounded I will ice prison myself for protection. If you want even more ice damage then use icy spear to debuff, works awesome with staff mastery. Then hailstorm, the spam frost wave. Rinse repeat. If it's just a low mob, a couple frost waves should take them out.
So spread out your points at the start. get the 5 into charge right away, and 5 into prismatic. You can leave that for awhile then add more to prismatic when you start dying more often. Main ones you want to level at the start are frost wave, hailstorm, ice brand, and ice prison