God it's been a while since I touched this.
This one's simple. Just a manager for two Vector2 points that does a simple deltatime translation. The cool thing about this is that it's flexible (as well as pausable through something outside of Time.Timescale, so it can be used for stuff like pause UI animation). Speaking-of, I have some stuff on that too, but since there's not a whole lot other than "it pauses," why make the update? Well, I also got started on audio, but "the player screams when they die" isn't worth a full post imo.
Demonstration: Two emitters with a back-and-forth.
Demonstration: One emitter moving in a diamond-shape.
This can also be used for cutscenes, since the "loop between points" is entirely optional.
I think by now my approach can be seen in making broad components that I can just mash together for whatever specific patterns/applications I want later.