I'm pretty into the idle/incremental game concept, though they're rarely implemented to my taste.

It's difficult to quantify what makes a good one, but my favorite is Universal Paperclips.

https://www.decisionproblem.com/paperclips/index2.html

Idle Champions is fun but the numerical scaling on that game is whacky. It only takes like a month before you're doing 1 googol (1^100) damage and little dwarves or gnolls or rats or whatever drop a similar amount of gold. They say it's to differentiate effectively between linear and exponential scaling, but the end result is just whacky.

It's the only game I've ever played where your damage output is most effectively measured by the size of its exponent