Checkpoint 1: Create player

I created an agent the shape of a penguin. I used the retro lab to help guide its movement and how to run the program.
The penguin moves left, right, up, and down. I noticed that when I move it over to the far right, the wall disappears. I think that's something I need to work on while figuring out collision detection.
However, my penguin does not move beyond the board.

maze_game.py

@@ -0,0 +1,8 @@
+from retro.game import Game
+from player import Player
+
+board_size = (100, 40)
+player = Player(board_size)
+
+game = Game([player], {}, board_size=board_size)
+game.play()

player.py

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+class Player: 
+    name = "player"
+    character = "🐧"
+    color = "purple"
+
+    def __init__(self, board_size):
+        # Start at bottom-left corner
+        self.position = (0, board_size[1] - 1)
+
+    def handle_keystroke(self, keystroke, game):
+        x, y = self.position
+
+        if keystroke.name == "KEY_LEFT":
+            new_position = (x - 1, y)
+        elif keystroke.name == "KEY_RIGHT":
+            new_position = (x + 1, y)
+        elif keystroke.name == "KEY_UP":
+            new_position = (x, y - 1)
+        elif keystroke.name == "KEY_DOWN":
+            new_position = (x, y + 1)
+        else:
+            return
+
+        # Contain penguin inside board
+        if game.on_board(new_position):
+            self.position = new_position
+
+