A big pile of precure get together and get into fistfights with a grab bag of villains. For a lot of fans of the franchise that's all you should really need to know, it's hard to go wrong with this formula. This one is fairly early on so there aren't as many precure running around as later all stars movies. It does have Tsubomi and Erika though, which are a couple of my favorite precure ever and in this movie they have a leading role.
This one isn't without its problems. The drawing style mismatches Heartcatch characters a bit, can be a little jarring. Characters weren't as expressive as I'm used to, Erika didn't feel all that Erikaish. Was kind of weird seeing Yuri sitting around doing nothing while all of the danger was happening, she was precure before Erika and Tsubomi after all but whatever. All I really need to feel satisfied are some good henshin sequences mixed with some kung fu and heartwarming moments and this movie has these things. One of the villains is made of solid gold and has a sweet mustache, pretty awesome. Was funny watching Erika and Tsubomi getting rolled nonstop, they were getting their butts kicked lol. Just don't push your expectations super high and you should enjoy this movie, it's better than a lot of standalone episodes of precure after all.