This map is part of the first batch of community made vanilla maps. It was made by Malixto.
If there are enough mice in the room, you can just pop the balloons by having many mice on one balloon. Otherwise, wait for the shaman to clear out a route in and out. If you pop the balloons, they will spread out and it will take too long to clear a path.
There is a ghosted platform that stops the balloons from floating away, but also stops the shaman from dropping objects from above to clear the balloons, so that is not a solution.
Note that if you have Nature's return, using it deletes all the balloons, instantly solving the level for anyone that knows how to do a basic wall jump. Use a spirit to help those who have not learned wall jump yet.