fix: fix buying logic for shop

src/shop.py

@@ -3,8 +3,8 @@ from src.item import Item
 
 class Shop:
     def __init__(self, ects, buyable_items):
-        self.ects = ects  # give the ects object ot the shop
-        self.buyable_items: list[Item] = buyable_items  # give the buyable items to the shop
+        self.ects = ects  # give the ects object to the shop
+        self.buyable_items: list[Item] = buyable_items
 
     def buy(self, item_name):
         item_to_buy = self.get_item(item_name)
@@ -12,11 +12,12 @@ class Shop:
             return False
 
         cost = item_to_buy.get_cost()
-        if self.ects.is_over_balance(cost):
+
+        # is_over_balance() means "has enough balance"
+        if not self.ects.is_over_balance(cost):
             return False
 
         self.ects.decrease_balance(cost)
-        # self.buyable_items.remove(item_to_buy)
         return True
 
     def get_item(self, item_name):