Interestingly, another GMTK game jam entry!
The rule seems to be 1 per year.
XD
https://notlordb.itch.io/idle-racing
The other incrementals I've played were either way too boring (nothing really going on), OR way too intense as a way of trying to overcompensate.
I remember a train one from last year, where there was just constant noise being spammed from like 5 or 6 different things.
It was supposed to make you feel like stuff was happening, I think, but it was just annoying!