I would recommend a saving facility. Quite tiresome to set something up, find out it wasn't quite right, and have to set it all up again! Nice thought-provoker though; reminds me of the game of life.
No good when you're missing a letter on your keyboard! ('u' in my case - I normally paste it in.) 4/5 because I liked the concept even if I couldn't get past level 2 because of words like "jump".
And a pretty one for the girlies:
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