The design of the project is awesome… ✨

I haven’t found a reference on that website for contact and contribution, and hence I leave a comment here.

They mention iTerm2 much so it’s likely their preferred OS is MacOS, yet I have no experience in it but Linux, and here I believe it’s worth to also mention some Linux terminal emulators like Konsole by KDE.

Konsole is quite featureful and extendable, and has support for plugins with custom CSS for its window styling, too!

I’ve attached a quick but relatively old preview found while currently being on-the-go.
In the preview we may see the changed, via CSS, scroll-bar on the right of terminal windows, and support for relatively complex prompt (i.e. OhMyPosh).

Related: Linux terminals, tty, pty and shell - DevTo