New features and plenty of code still in testing. This includes a level select, basic inventory, and a basic HUD.

Player/Inventory.gd

@@ -0,0 +1,45 @@
+extends Node
+
+signal update_currency(amount)
+
+var __currency: int
+
+var __weapons: Array
+var __accessories: Array
+var __categories: Dictionary
+
+
+func _ready() -> void:
+    self.__currency = 100
+
+    self.__weapons = []
+    self.__accessories = []
+    self.__categories = {
+        'Weapon': self.__weapons,
+        'Accessory': self.__accessories}
+    return
+
+
+func get_currency() -> int:
+    return self.__currency
+
+
+func add_currency(amount: int) -> void:
+    self.__currency += amount
+    emit_signal('update_currency', self.__currency)
+    return
+
+
+func add(item) -> void:
+    self.__categories[item.type].append(item)
+    return
+
+
+func discard(item) -> void:
+    var index: int = 0
+    for itr in self.__categories[item.type]:
+        if itr.equals(item):
+            self.__categories[item.type].remove(index)
+            break
+        index += 1
+    return