I've started but never finished plenty of games but one always annoyed me till recently was factorio. I had over a hundred hours and I never even automated blue science.

Then a few months ago I said screw it, started a new save and over the course of 3 months and 150h I finally launched a satellite into space.

I am quite happy now that I did "beat" it but I'll probably revisit it soon, either to try improve my base or to play modded.