This should probably not have been marketed as if it was a "movie". It's an extended series of disparate Melanie Martinez music videos with a wafer-thin membrane of overarching connective tissue. If you are a fan of her music, then, obviously, you should probably watch K-12, not even just to "support her" but because her music is what makes up 90% of the runtime. Personally though, I don't care for it, which I figured meant the best option I was left with was to basically ignore all that, and just judge K-12 on the narrative. Which is not great. Bad, even, I think I could argue. I know that that's not the point, it's not an actual story, it's a music presentation. But to watch this as a movie it doesn't work. I even watched K-12 with somebody who specifically does like Melanie Martinez's music, and even she was yelling at the screen's nonsense. The pastel colour scheme/lolita fashion thing is also not my speed, but I appreciate the dedication to it. Final rating:★★ - Had some things that appeal to me, but a poor finished product.