finished the game

The program in unit 1, the turtle would draw whatever you made when it starts, but for the
nav_game the objects are already made, and you can move things around after it starts

spaceship.py

@@ -2,3 +2,25 @@
 # ------------
 # By MWC Contributors
 # This module defines a spaceship agent class.
+
+
+class Spaceship:
+    name = "ship"
+    character = '^'
+
+    def __init__(self, board_size):
+        board_width, board_height = board_size
+        self.position = (board_width // 2, board_height - 1)
+
+    def handle_keystroke(self, keystroke, game):
+        x, y = self.position
+        if keystroke.name in ("KEY_LEFT", "KEY_RIGHT"):
+            if keystroke.name == "KEY_LEFT": 
+                new_position = (x - 1, y)
+            else: 
+                new_position = (x + 1, y)
+            if game.on_board(new_position):
+                if game.is_empty(new_position):
+                    self.position = new_position
+                else:
+                    game.end()