Brendan Dawes pointed me to this wonderfully playful creation. It's Flash-free, believe it or not.
On the tenth day of Newton, My true love gave to me, Ten drops of genius, Nine silver co-oins, Eight circling planets, Seven shades of li-ight, Six counterfeiters, Cal-Cu-Lus! Four telescopes, Three Laws of Motion, Two awful feuds, And â€¦
A brilliant take on Space Invaders where gravity does its thing.