An interesting exploration of some fairly heavy themes (which I won't spoil) on a tiny budget, The Paragon does well to switch between quirky character moments, trippy 70s-style visuals, and a great synthwave soundtrack (which doesn't feel as pretentious as it does in other recent films parroting 80s culture).
I'm not sure that the comparisons people have drawn between it and things like Flight of the Concords and What We Do in the Shadows is particularly fair, since this one has a heavier, more melancholic tone (likely partially due to the cool color palette) and does have funny moments but at nowhere near the frequency of the aforementioned works (which is fine; it's just different).
Basically, if you go into it as a quirky indie dramedy, you'll have a decent time. It didn't quite hit the mark for me, but it was worth seeing nevertheless, particularly for those who like time travel stories, and I like seeing weird little auteur works like this still getting made.