Those colors look extremely bright. I can't possibly imagine a good build such neon colors. Could you share a default build with this colorset? You can "correct" it if need be. Also, for the browns, I suggest you try experimenting with different shades. It looks as if you took one brown, and then lightened and/or darkened it a bunch of times. Instead, try using more reddish, mahogany browns, or perhaps using yellowed, old-looking browns. Having diversity in that way can lead to some amazing results.
A common thing I tend to dislike in most colorsets is the lack of balance, too. The way colorsets are divided gives you enough room for 7 columns of 9! That means you can have:
- Three shades of a color! Try having a standard column, either a bright or dark column, and then a softs column. Remember that they don't have to be perfectly darker than each other (e.g., #4444dd leading into #000099). It's more interesting if your colors are slightly varied. On the same subject, don't have two obviously similar colors, such as blue and cerulean, in the same colorset. Each color needs its own purpose.
- Transparents of those colors, too. Optional, but recommended.
- A row for special colors with clear purposes. Try using 2 for Red, Green and Blue, and then the extras can include other colors, such as your completely transparent color. Some colors I recommend are a transparent blue for clear water and a medium red for blood or alarms (#a10000 is what I use for this).
- A brownscale. Again, vary your browns. Also, it's a nice plus if your orange is dark enough to be an extra brown!
- A grayscale, too. 9 colors, sadly, isn't much for this, especially if you want transparent neutrals.
With so much space, it seems unfair to divide your colorset so unevenly. 9 base colors is just enough to work with, in all honesty. You get Red, Orange, Yellow, two shades of green (the only color I suggest having multiples of, as it's useful for grass), Cyan, Blue, Purple, and Magenta in a single column. That's probably more than most people will use!
These suggestions only apply for general colorsets. Ones with more dedicated purposes (landscapes, a gamemode that requires specific colors in its build, etc.) should not follow my suggestions, as they usually require more monotonous or diverse colors.