(Just for fun)
{% gist a832613064f958641330 %}
Maybe I'll add a GUI and some tools later, but for now you have to do something like:
(start-game)
(add-life 4 5)
(add-life 5 5)
(add-life 6 5)
(print-board)
(step-board)
(print-board)
which should show
###
followed by
###
and so on ...
Update:
It's easy to try out patterns. Here are a few typical ones:
{% gist 527c5fa85b316c84e9ba %}
Then you can do something like
(loop repeat 5 do (print-board) (step-board))
and watch a few iterations. Of course, this is probably better implemented as a mobile app, I suppose. But yeah, still fun. Try out a few other spaceships if you like ...