To be honest, I feel that regardless of Vampire Survivors lack of updates in a long time, still surprises players because the game has a more clear and actually directed way to unlock new characters, weapons and maps as you play, while 20 minutes till Dawn has some drawbacks when it comes to the way the game gets updated little by little, adding slowly new weapons and combos, new maps and even the opportunity to customize your character and the environment, but only in the most recent "free" version instead of the paid one, which is just very weird because: how comes that the game you are paying for gets less attention than the free version? What's exactly the plan? Besides, the free game doesn't let you play unless you -strictly- have an internet connection
Anyways, I'd say that Vampire Survivors is better than 20 minutes till Dawn, at least from my point of view