I'd like to report a bug of sorts
I happened to save the game during Vivian's personal training (more specifically, the second - illusion-based - stage) and after I loaded up that save, the illusory images which normally should fade in and out slowly were instead flashing as if on fast forward
Otherwise, what a great game! I've already spent countless hours playing it and haven't even advanced past the forest area - there's just so much to do!