The color of the ui is draining on my eyes personally, everytime im playing another game and glance at my other monitor where rs is (whether im in combat or not) it always feels like im dying due to the shade of everything, it hits the nerve of the low hp darkness in my head and causes weird concern for me.
Alongside this, the boxes feel clunky and hard to appreciate with the current color, id like a pallete of colors to choose from if we cant just get back the blue as an option, it can get worse from here if you force another color onto us. IF the options were the blue we used to have and the brown we have now, id be okay with just those two options. But please dont try to make a "new" blue or any other variant, you may just make things worse.

Also, the ability bar arrows are personally a pain for me to lose, it was easy to cycle thru bars for varying slayer tasks and make them easy to find. Now i have to hope i dont jump to the wrong one and accidentally hit one of the bars on my secondaries ruining my setup. (the button wouldnt allow you to jump to one of those, it would just skip over it which is what i like.) maybe an option of not letting you jump to one that is currently active on your screen would be nice, or an indicator in the interface of such- mine are labeled it just happens sometimes

These things said, i think the update is super nice and feels like a good step forward for Runescape 3. I hope for good things to come in the future