For the sound effect of Am's lightsabers held by several mechanical arms, sound designer David W. Collins combined those of General Grievous' multiple lightsabers with that of Kylo Ren's unstable blade.
The Twin Star Destroyer is a "Gemini Class" ship. Keeping with the theme of twins, the Astromech droid is designated R-DUO, and the protocol droid is named B-2ON (be two one). The Imperials are identified as "T-Stormtroopers" and "T-Imperial Crew", which would also appear to stand for twins. However, according to the book "The Art of Star Wars Visions", this T stands for "Trigger" as in the name of the animation studio.
The designation of protocol droid B-2ON was constructed by taking the letters and numbers from C-3PO and shifting them back one space.
Next to TIE Fighters, a TIE Interceptor and a TIE Bomber seen inside the hanger of the Gemini Class Star Destroyer, there are also Rebel spaceships such as the X-Wing, A-Wing, B-Wing, U-Wing, Y-Wing and even Clone War era fighters such as the Jedi Interceptor and a V-Wing.
Takes place in "Legends" continuity, not bound to any of the existing Star Wars films or TV series.