The creators of Slay the Spire have talked about how they gathered statistics on player runs and used that to balance the game. Does anyone know other games that have done this? (Especially single player games.)
When working at https://curvefever.pro we tracked a lot of stats like win rate with specific weapons, hit rate, usage rate, etc.
If one specific weapon or weapon combo became too popular with a too high win-rate, it usually got nerfed or the others were buffed.
You can see all the changelogs in the game.
Sometimes the changes were very simple and minor % buffs/debuffs: https://s3.amazonaws.com/i.snag.gy/etLjaJ.jpg
Sometimes the ability was changed to make it harder or easier to use, or to remove some OP side-effects (e.g. shooting laser would slow you down too much, which in this game it's also an advantage, as you can brake and avoid collision using the laser).