Thank you. Glad you like it. :)
I will try to correct the volume option issue in the next builds.
The possiblity of scrolling back with the mouse wheel has been requested by others too (as it is possible in Ren'py, for example).
Visual Novel Maker (the engine I use) unfortunately doesn't have this option implemented and I can understand that the backlog possibility isn't exactly mind-blowing either. I can't promise it, but will see if there is a plugin or something to improve this.