go check out the original, remixed it to have a rainbow. to change the amount of particles, go into the editor, and go to backdrop. there is a block there. press flag after updating the particles, otherwise the colors break. only 300 particles because of lag. Pretty intuitive, change the sliders. Hide the sliders by using the handy button on the right bottom corner. this is basically useless, since you cant use it with particles with a lot of code. and because this is slower than the clone system. it just makes it so you can have more than 200 clones.
do you want to run it with like 10k particles? https://turbowarp.org/925499058/editor