I really like horror games and rhythm games, so I've had this idea of combining them for quite awhile now. It would be heavily inspired by real virtual singers/voice synths like Hatsune Miku and the cryptonloids, but with it's own original voice synths (made using UTAU)...and the game itself would be an actual game in it's own universe if that makes sense?
It starts off like a regular rhythm game: you're given a selection of songs and difficulty levels you can play them at. The more you progress and get better scores, the more points you get to unlock more songs, CGs, as well as other bits and bobs to maybe customize your menu or maybe there is a sort of mini game where you can customize a space or give gifts to these virtual idols.
However, the game would keep track of which idols you give gifts to and which songs and CGs you unlock. If you have been giving more attention to any of the idols that aren't the main girl, the game would start glitching. Certain songs sung by the other idols would disappear or would only be available to play on the hardest difficulty, the CGs would get more glitched or grotesque, etc.
I was thinking a lot about vocaloid songs like The Disappearance of Hatsune Miku (https://youtu.be/kvnIFo3xMfY?si=beOXjnCVFMe2FGmc), The Confusion of Hatsune Miku (https://youtu.be/W7mYHZVa-d4?si=lorHnT6p4RhzNIsv), Sadistic.Music∞Factory (https://youtu.be/_kM6MQgiPPg?si=XuVADqQ4R-Ukt9QF), Odds and Ends (https://youtu.be/dGNoCICGmo0?si=UVSKIFoz9q6ui7xv) and Miku Miku ni Shite Ageru!! (https://youtu.be/AwHvSGeGf3g?si=TzKfzydPpz6FX4ok). Basically all these beloved songs that depict Miku being fully aware she is just an instrument. A virtual idol's gray area between immortality and mortality is interesting to me and horror seems like kind of the perfect way to explore it?
The main idol of this game would be aware she is technically immortal, but can only truly "exist" so long as people are making songs using her voice. So she'd get a liiiiittle upset if you gave the other idols more attention (aka go a bit crazy and break the game until she's the only one left)
Unfortunately, I'm not a great writer and I don't know much about game design, so this is all a pipe dream living rent free in my head. I did design the idols that would appear in the game, though! Because at the very least I can draw lol
Spoiler
(https://files.catbox.moe/qlonpu.png)
This is Hana/Yamada Hanako, the main girl
(https://files.catbox.moe/rvxjuv.png)
And here is Hana and the rest of the idols. This doodle is from may of last year lol