Thank you for checking out Eldritch Idol! I'm glad you're enjoying it!
If you want some advice: it's not possible to raise all three of her main stats (singing, dancing, and charisma) in one playthrough. I tried to balance the game so you can't max them all. Instead, you should focus only on raising two of these stats, while trying to keep her affection high. That should make things a bit easier!
I hope this helps!