Fix the Maze Game

Overview

You are given a maze game implementation with several bugs and one missing feature. The game represents a simple rectangular maze where a player navigates from a start position to an exit.

What's Broken

The maze.py file contains a Maze class and a MazeGame class with the following issues:

1. Out-of-bounds moves incorrectly increment the step counter
2. Wall collisions incorrectly update the player's position
3. Shortest path finder considers all four directions instead of only DOWN and RIGHT
4. Score computation is not implemented

Scoring

Your solution is evaluated on how many of the 11 test cases pass. Each test is worth equal points.