Hey, thanks for the comment! Let me follow up on the technical issues:
1) I can't reproduce the mouse issue on my own machine; the feel is similar to Ren'Py with both an external mouse and my laptop's integrated one (though I notice the latter is sort of wonky to use with both). If you happen to have some kind of unusual setup, it would be helpful to have more details!
2) How the sliders work turns out to be really unintuitive for this game in particular, since the engine thinks of the classification as being looping vs. non-looping, and by coincidence most of the music ends up in the latter category and most of the other stuff in the first. I'm reworking this whole thing for an upcoming project and will probably just get rid of the separate sliders altogether, since the music vs. sound effect distinction is not entirely clear and doesn't really capture how I approach audio design in a super useful way regardless.