My suggestion is to have each particle behave in a predictable way instead of randomly. It would also be cool if there was a menu where you could place particles. That is all.

Sometimes I sit watching and wish I could change it a tiny bit.
I think left click should attract and right click repel or vise versa.

When Universe first starts, the console is spammed with the message "Failed to set DirectInput device axis mode: 1"

It seems like there is a dependency missing—canvas-sketch-cli. I guess you have that installed that globally. I think you either should say that the user has to download that globally in the README or add "canvas-sketch-cli"as a dependency in package.json. I am not completely sure what's best, but I think the latter is the best practice 😄

Without a massive overkill of autoconf or cmake just find and install the ENTIRE
SMFL library. In Fedora it's capital sensitive so look for SMFL and SMFL-devel. Once those are installed and your SURE they are installed then for 64bit Fedora try this as a shell script
Since I don't have a 32bit system handy you may be able to run this as is or remove the 64 bit reference. SFML is butt sniffing slow and while it seems easy to use it is highly meh.

`#!/bin/bash
g++ -I/usr/include -I/usr/include/SFML -L/usr/lib -L/usr/lib64  Main.cpp Universe.cpp -o particlelife  -lsfml-graphics -lsfml-audio -lsfml-window -lsfml-network -lsfml-system`

Try the javascript version perhaps? It allows on the fly settings and it runs in a browser from the below link, go one up to get the code so you can use it elsewhere. It is very much faster or seems to be.

https://fnky.github.io/particle-life