The supplied installation command:
curl -fsSL https://sprites.dev/install.sh | sh
Produces the following error on Ubuntu 24.04:
sh: 2: set: Illegal option -o pipefail
This is because the install script uses bash-isms, and Ubuntu's /bin/sh is provided by dash, which does not support them.
Instead, the working command line is:
curl -fsSL https://sprites.dev/install.sh | bash
...which works just fine. Bash is present on both your advertised supported platforms (MacOS and Linux).
This is literally the first command copied-and-pasted from these docs, and the fact that it immediately fails (and requires a certain amount of debugging of your install script to work out why and make further progress) does not inspire confidence.