Thanks a lot spiegelbild! I must confess I fell a little in love with Bella during the development too. I didn't change her character model, but I did get better at rendering the images as the game progressed.
The friendship/platonic routes would have been a great touch, but I had to prioritize. Adding them would greatly enhance the immersion of the game, I agree completely. For the next project I'm trying to strike a better balance between the romantic and platonic, so that the game doesn't feel as empty if you don't pursue a particular path.
I started Sisterly Lust on my own and have been developing it for the past two years in my spare-time and I must say that there are quite a few lessons I've learned about developing visual novels. So my next project will hopefully build on the strong points of Sisterly Lust and I hope you'll get to enjoy it too. ;)