I'd argue twin stick shooters like this are VS grandpa.
Random-ish waves of enemies, bullet hell, increasing difficulty.. The main differences are the powerups instead of permanent level ups, usually the lack of autoaim (right?) and maybe lack of meta progression.
Crypt of the Necrodancer lets you add custom music. I don't think it is able to handle music streaming though it is a bit of a manual process iirc. The gameplay is pretty different from Vampire Survivors. Basically enemies all move and attack in patterns that increment based on a beat, and you need to time your movement and attacks to the beat as well. Fun game