04:48:225 (1) - I realize that this slider serves to cover a very long sound, but I clearly see some problems I just can't really reconcile.
The first issue I have is that of the fact that two separate hitsound inherited timing sections are used for the slider. You really don't need to split it into 15% volume and 5% volume; it's absolutely unnecessary. What would the 5% even serve to soften? The slider ticks? I can't imagine that being the reason, since slider ticks are not generally hitsounded. The end node of the slider? Why? On playback, I heard no meaningful difference. The custom hitsounds? People can set it to be ignored, so it isn't universal. All things considered, there is no reason for this volume change. Keep it at 15% or keep it at 5%. But there's no reason to do both.
The form of the slider is also questionable. What exactly were you trying to do? I see a heart, but what about the spikes? Are you trying to portray something like a knife or arrow through the heart? Because if that is so, it might be worth noting that the points have no angular perpendicularity that creates a regular polygonal outline or relief. The two parts on the right are not positioned or angled in a way that they form a closed object (sans rays) with the part on the left. If you went with a sharper bend in the beginning and end nodes, as well as a more pronounced dip at the bottom, it could be done more accurately, given a slower SV like 0.25 or 0.20 (Let's face it, you already had to crack open the .osu pretty much for the sake of getting 0.30, so this isn't much more difficult).
I also question if a slider is really the best fit here. I listened to the S-R about 50 times, and I swear that the only thing that would make sense here is a spinner (as a slider only captures wider dynamics like pitch shifting, slurs, or legato transitions). It's so stable in its sine wave that there isn't a call for the extensive articulation present. The note also ends a slight bit prematurely in the slider at 5:05:271 when it really ends at 5:05:413 (one 1/4 tick later). I turned up my headphones to the max, and I am 100% positive you end this one 1/4 tick too early.
I realize that this is in qualified, but I'm just giving my honest feedback. I really believe that you either need to rework the slider or use a spinner instead, and I know you have the wrong duration for that note.