I've said my input that the magenta is a bit eye searing at point were I have to turn it off when im making the levels. I'm standing on these choices for what i'd suggest.
Basic RGB value - default it to the original color, change it by sliding the values to something more easy on the eyes, include presets via a dropdown menu if you're worried about those spending time in the options
A softer contrasting color - While colors like magenta and yellow are contrasting, finding a contrasting color that's visible enough without it being blindingly bright would be a better solution, colors like Purple or Light Teal (think the color of baja blast) may be more easy on the eyes
Basic RGB value - default it to the original color, change it by sliding the values to something more easy on the eyes, include presets via a dropdown menu if you're worried about those spending time in the options
A softer contrasting color - While colors like magenta and yellow are contrasting, finding a contrasting color that's visible enough without it being blindingly bright would be a better solution, colors like Purple or Light Teal (think the color of baja blast) may be more easy on the eyes