Hi friend, I really liked the game overall. As you said, it has an energy system, but it's only for exploring, and in this case, the energy is used to walk or move faster from one place to another. There are two versions, one without energy and one with energy. In the case of no energy, at least from the starting point to the plane, the time without using energy was 7 minutes, whereas with energy it was 15 seconds. And yes, you can also take a break and then play in your free time to advance little by little.