That was such a fun and interesting game! The designs are fun, and I love how expressive Essy's are specially with the change in pose and colors! It really transmitted a playful personality so well, I want to commend that extra effort!

Slight spoilers?
I can't help but feel there's some relation to "Quintessence" "Will" and the protagonist having "Heart" motif. While playing I kept wondering if the memories where of MC secretly, or one of the two, but I don't think that's the case. after all. Perhaps someone MC knew, since in the bad ending it says "you're not her"?