Half a year of porting now fits in one Saturday?

Real case: I decided to try breathing life into old projects using opencode + glm 5.1. Took a friend's (volkov_ayyy) game from 15 years ago, originally built on FlashPunk (Flash/AS3). In literally one day I ported it to HTML5, fixed bugs, completed the main game loop, and added micro-features.
Check out the result: dotcopter.netlify.app
Of course, turning the original into a great game would still require a lot of careful work — but for a 1-2 minute toy, the result is awesome. The key thing is that now the project can actually be continued — the barrier of insurmountable effort is gone. Old projects can live on, become more interesting, and delight people!
P.S. A guy recently found me who played Craqua (my 2009 game) 7 years ago — he still remembers it and wants a sequel, haha.