I love the colors changes, like in irridescence, those are much better than the same effect with multiple variant .

Actually, this one is pretty nice IMO. Reminds me of how the bats of SBTWC/CV/PS and The flames effects are similar. Color change is kinda drastic like said before, but still not bad

I guess? But if it was only one color then it would be even more similar to the other unusual you mentioned, which seems like a pretty unwinnable situation

(rephrasing earlier comments)

i really like the look of this effect, though Diva Dan did something very similar with "Gilded Trail".
the big thing i'd like the point out between that effect and this one is the color variants. Gilded Trail effectively makes itself known by only being one color: gold! it makes sense because "gilded" means gold.
this, however, has four different base colors which all fade into another color to no benefit or reason.
many effects these days seem to contain multiple colors because it's trendy, but with more and more content each update, unusuals start to lose meaning both independently and as a whole.
color variants affect this by devaluing the sense of rarity and uniqueness that effects have, seeming like they NEED to be something more. i just don't see the need to do this if your idea gets across fine with one or two colors.

besides this, i do like the movement of the trail and use of fading - it just shouldn't become a different color entirely.

purple effect is amazing I hope it gets added for 2022 summer case

Thanks a lot! Though this effect stays the same regardless if you move or not.

can you add a gif of the player walking to see how it looks?, this is a cool effect