Here's why:
* Separate Characters: Mickey and Oswald are distinct characters with their own unique abilities and gameplay mechanics.
* Two-Player Gameplay: The game is designed for cooperative two-player gameplay, where one player controls Mickey and the other controls Oswald.
* Individual Abilities: Mickey uses paint and thinners to interact with the environment, while Oswald uses his magic to solve puzzles and battle enemies.
Therefore, switching between the characters is not a gameplay mechanic in Epic Mickey 2. You always play as either Mickey or Oswald, depending on which character you choose.