If you're getting a gameover when trying to switch characters/viewpoint (between Mikami and Rai), update your game. v1.0 contains the bug. The first update, v1.2, fixes it.
To those that use JoiPlay to play Vitamin Quest 2 and get a "no such file directory" error, copy these into (game folder)/audio/SE and it should work. It did for me at least.