Nice work!

I'm glad you didn't run into either of a couple of challenges I had with similiar strategies
1) Frozen orbs appear behind your team even if they have their backs to the wall - inside the wall!
2) Buggy frozen orb sits on the floor even after it is killed and stays targetable with zero health (meaning your DPS does no damage to anything after the orb appears)

Just be aware that those may happen to you in the future - I hope they don't!