I moved you post into a separate discussion in order to prevent any confusion on a unrelated topic.
To better assist you, can you please provide us with more details of the issue you are having? I noticed you replied in another discussion how you were able to complete the level. We would still like to know more details. Please indicate the previous steps you attempted prior to completing the level.
I am having the same problem, I think. When I ride the rainbow bridge to the last section, where the Illuminator Tower is, I pick up two snowmen on the way there, and then I see six enemies throwing snow at me. I use the Wiimote to throw snow balls at them, but they don't disappear, and my snow gets depleted. After I have hit each enemy once (I have enough snow to all six once each), all my snow is gone, and I'm stuck going around and around on the rainbow rail, with no way to get past that part. All of the enemies are still active. I have posted a video showing me hit the last two "active" enemies. You can see they get hit, but don't die. They just shrug off the hit and keep attacking.