I was brought in by the overwhelming amount of memes, but the music of the franchise is the ONLY thing that is keeping me around this fandom since the pandemic. It's oddly satisfying in a way that other music from other games unable to do (except the Katamari series).
The games are okay however they're too punishing for me and the bullet hell genre is pretty stale for my taste so I eventually quitted after 2 years of playing the games continuously. Though I need to give them credits for immersing me with the awesome music, it's like it's an album with a game inside of it.
The canon lore I've acknowledge during my time of being in this fandom is also pretty interesting and sometimes outright funny (haha futo arsonist) but I don't feel motivated enough to dive deep in it.