Cute game! I like the take on the theme, like the game is taking place in a world where the heroes and villains are putting on a show and you have to clean up after them.
If you ever decide on expanding this concept, I would also make it so that every enemy you revive also tries to attack you as well, which would make the player think about which order they revive enemies in so that they don't get defeated by harder enemies.
Otherwise, I had a good time with your game :)