Awesome man! Thanks a lot!

Unfortunately though, I think I found a bug... For some reason you can't select the first color, though all the rest appear to be selectable...
Aside from that, I have a slightly more complex, though definitely more useful feature request -- could you let the user change the reflectivity/highlightmultiplier/darken, etc. of JUST the currently-selected color OR all the rainbow colors at once? It'd just require a few more sliders, but it'd make it a LOT easier to control an entire palette as well as individual ramps simultaneously (so you can look and see how they play together side by side as you create 'em).
Also, is there any way to adjust the contrast between the colors on the ramp? If not, I would suggest slider(s) for that as well for those of us who want a little more manual control (both for an individual color, OR the entire rainbow). If you needed to, maybe a toggle switch could work to lock the contrast for the selected color (and use that base contrast to generate that color's ramp using all your other sliders.) This would be ideal when you need some gradients to be 'soft' and others to 'pop'. You could generate a 'hard' OR 'soft' contrast ramp with the Add/remove color command -- but a "duplicate current color" command would be helpful there in the case that you had to have both a soft and a hard version of a color ramp in your palette.
Color selection is a hard thing to come by any good tools for. Even without my new suggestions, this is already shaping up to be an amazing tool for pixel art! If anyone hasn't tried playing around with this yet, they really should. It can almost create any kind of palette they wish. With my new suggestions, it really would be able to! I definitely want to know about any future updates on this! Thanks again for making this dude!