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Make the replay control keys configurable.
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Reduce number of loop index variables.
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Fix color of the status bar texts.
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Reorganize the code for speed: move the main game loop to the top.
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Put two mines at two random entries of the nest. The original game put one at a fixed entry. Better yet, anywhere inside the nest.
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Put Bill anywhere inside the nest, not always at the center.
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Rewrite the rescue effect.
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Don’t delete the status bar when preparing the next level.
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Let the language be changed on during the game.
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Make beep also after a valid key menu.
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Do the saluting also at the end of the replay?
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Make drawing faster by replacing UDG string variables with literal strings.
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Display the key in the replay of level 6.
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Add "any other key to return" to instructions and credits.
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Replace flowers with cans, bottles, etc. Increase the score when they are collected.
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Allow negative scores, but display zero as minimun.