Great puzzle concept! Kinda reminds me of a Flash game from back in the day where you play as an overworked Japanese Employee whose goal it was to kill himself...anyhow, the puzzle design in your game is really clever, and the visuals and music are great overall. Good stuff!
Main feedback that I have is to provide a restart option in the middle of the level (such as a pause menu) as it is difficult to recover when you made mistakes in choosing which character to revive as first and whatnot.