TODO
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* At the end of the game, the score should be compared to the high score.  If larger, store the high score.
* When the player dies, the mushrooms need to be reset and the score incremented for damaged and poisoned mushrooms.
* Implement the code to support pausing the game
* Implement the code for supporting a two player game
* So much more.
* Why is there no sound?  Because I haven't coded any...