2d is fine.
i had phone app that had neat galaxy parallax animation. it was a few 2d layers of stars to simulate depth. main animated stars would appear in diff sizes and sometimes colors and eventually disappear. but it had a basic nasa photo looking background that didnt move (that part sucked). some clusters and asteroids and planets and other spacey stuff would appear and move. but if EVERYTHING was procedural generated, no background image, and moved and animated in entertaining ways.
i would pay good money lol. it seems so simple and obvious but i cant find this in existence.
we are decorating a pretty sweet chill room. lots of floor type seating. we arnt fans of art and other stuff on the walls, we are wanting something unique to always have in there.
my needs sounded pretty basic, but i guess there is no real limit to how complex or graphic it can get since its just running off whatever computer and monitor/projector you have.