With the prolonged development time comes problems: he's going to have to keep upgrading.
Resolution has to be improved; he's already moved platforms and gone 4k.
Animations weren't a really a thing in 2017; now he has to put them In.
Voice; he's starting to look into adding audio, and actors.
Models; already starting to look outdated. Will start to look cartoonish by comparison.
With every advancement in technology, L&P is going to have to keep adding more and more. With 50+ year estimated timeline, He's going to have to turn Pac-Man into CyberPunk.