Energy is needed to progress further into the plot of the game.
Energy can be used for hints (6 units of energy), skips (18 units of energy), and actions in the game (picking up an item in your inventory, starting a mini-game, etc.).
At the beginning of the game, you have a pool of 360 energy units.
Every two minutes, a lost energy unit is restored.
You can also buy energy with coins and in the in-game store.