It’s not designed to work from the command line only. At the least, you would need a headless server (such as Xvfb), and it would be very difficult to configure. Controlling it remotely is possible, but it can be difficult to get right. You may be much better off using VNC to control it, rather than trying to use it from the command line only.
Syrinscape, as far as I know, do not currently provide a Linux ARM version. I doubt they would be able to do so easily: they rely heavily on Unity, which doesn’t support Linux on ARM.
Regarding the AUR build, that doesn’t apply to Ubuntu; it’s a different system than Ubuntu’s
apt-get. My friends and I do use the regular Syrinscape player on Ubuntu (on x86_64) and Debian (which is very similar to Ubuntu).