There was never a dull moment and I think it's a great movie. Feels very OVA-ish with a slice-of-life tone. I liked having no worries for once, although I was honestly worried for Subaru when some deja vu moments came up, but he laughed it off himself so I thought it'd be fine. Roswaald was amusing as usual and Subaru's comebacks were also funny.
We also got some expansion into Puck's backstory, and how he met Roswaald was also shown, with a comment from Emilia 'the map had to be redrawn afterwards' describing the scale.
Towards the end, we also get both drunk Emilia
and Rem, and a very happy Subaru.
We get an expansion into one of Puck's inner workings (literally), and how he met Roswaald. Although there wasn't anything that extended the plot shown in the anime, it was an interesting story.
Some still panning frames here and there, but overall I enjoyed the art, especially that of drunk Emilia and Rem. We also got their chibi versions right from the start. I really liked the snow fragments under the starry sky towards the end.
Nothing impressive, but nothing to complain about either.
Every character was shown in some way, and the entire Roswaald faction got development.
I was entertained every second of the movie.