I might have forgot to mention this in the tutorial, but the effect will only start showing up AFTER you're on a route. And since the demo only goes up to the route choices, it won't show up. In addition, not every choice affects points for every route, so in that case, the graphic wouldn't show up either.
Ok thanks that makes sense that it would only activate after you got on a route. Thanks for your quick reply! I'm really enjoying this game. Also very happy there is character customisation which allows you to play as a darker skinned character, which is not that common in visual novel games in general. I look forward to the release, and if I'm honest I would have paid money for this so the fact that this is a free game has me astounded (but very happy of course!)