Hokuto Force made a nice C64 'edutainment demo' about Space Invaders for its 40th anniversary:

https://floooh.github.io/tiny8bit/c64.html?file=c64/space_in...

(only works on desktop because at one point you need to press a key to advance)

Apparently, adjusted by inflation it's the highest grossing entertainment product at $13 billion :o