League of Legends is getting a Vampire Survivors-style PvE mode later this year
Bullet heaven games are essentially the reverse of bullet hells: Instead of trying to dodge endless, nigh-impenetrable waves of enemy projectiles, you are the source of those projectiles, using them to mow down endless, nigh-impenetrable waves of enemies. I'm pretty sure Vampire Survivors wasn't the first game of the type, but it was definitely the one that dragged it to prominence, inspiring all sorts of imitators—including, later this year, a new game mode in League of Legends.