Just curious about the qualifications for the S+ Rank, what are they? Ive gotten the S rank with all 15 secrets and 7 heals. Or do we just need the S rank?

You need S+ rank. Im not sure what the exact cut off is but you can either get all secrets and use some heals or use no heals and leave some secrets out. (I can confirm that 15 secrets and 3 heals is S+)

Okay thanks (also just got it with 4 heals)