Happy to know you noticed it!!
And yes i've intentionally removed the heart
1) i had a feeling it was a bit too fast, thanks for pointing it out you also felt this way. I've written down to include slower absorption for future scenes
2) i'm not sure, i think a hanging tongue could defeat the intention of them being a bit harder to see
3) i'll be doing that, don't worry!! (･‿･)/
4) planned to come!! But maybe even outside of the gallery!!