Take away the first and the last couple of minutes of this "movie" and you have a decent longer-than-usual episode of Heaven's Lost Property. As a fan of the anime and the manga, I enjoyed it. BUT...
The first and last few minutes of the movie are enough to ruin the entire experience. These parts hint at a final epic conclusion that is never reached, and the movie effectively ends on a cliffhanger. (And if it's not a cliffhanger, then it's the worst ending to a story I have ever seen.) This movie is like someone took a scene from near the end of a movie, chopped it in half and inserted a completely unrelated story with the same characters into the middle. So even though the movie is enjoyable to watch, this lead up to an epic conclusion that never comes (and the fact it is neither explained how they got to that point or what happens afterwards) is enough to leave you feeling empty and asking yourself, "What did I just watch? What was that?" The fact they only made this 50 minutes long makes this atrocity all the more inexcusable.
If you watched the series, SKIP this movie (and the other one too) and just read the manga to find out what happens. The anime followed it pretty well, it is much more satisfying than watching this movie and it actually concludes the series. If you love the series, you will get some enjoyment from this movie, but at the cost of your sanity. (Preferably, skip the part with Ikaros and Tomoki flying together at the start and at the end of the movie, and just pretend you're watching an episode.)
