player: {
    hp: 50,
    inventory: []
}

levels: [
    {
        layout: {
            | * * *
            | * e *
            | * . *
            | * . *
            | * . *
            | * . *
            | * s *
            | * * *
        },

        items: [
            {
                id: "key",
                x: 1,
                y: 2,
                name: "Sleutel",
                description: "Deze sleutel kan een deur openen",
                useTimes: 1,
                value: 0,
                actions: {
                    [not(inventoryFull())] retrieveItem(key),
                    [] leave()
                }
            }
        ],

        entities: [
            {
                id: "door",
                x: 1,
                y: 4,
                name: "Deur",
                description: "Deze deur kan geopend worden met een sleutel",
                direction: up,

                actions: {
                    [inventoryContains(key)] useItem(key),
                    [] leave()
                }
            }
        ]
    }
]