I speak only for myself, but: I can't think of any other computer game that I've spent time on, and that I look forward to playing again, over such a long span of time.

While I don't play it often, I have been playing it for over 20 years.

It's impressive (again, at least to me) for its longevity if nothing else. Just seeing that it continues to progress makes me happy in dumb ways.

Yeah same here.

It has the competitiveness of games like Civ, The Settlers and so on. But with the world building aspects of games like Sim City.

There aren’t many other games that strike this balance as well.

I first started playing the original DOS game in the 90s and I honestly think OpenTTD looks and plays just as well now a the original did 30+ years ago. The level of detail in the pixel art is ideal for the type of game it is.