That's dope! Feature idea - multiple "lightsabres" in the same frame with collision detection with sparks/sound FX. I can give you the gfx/sound assets if you need :)

Used to make little films with my kids using After Effects - here's one - https://youtu.be/IRyy2BhbuaU

They love it but it's quite slow and painstaking. Instant AR version would be amazing.