I did not care for this because there wasn't much going on. it was just a single gag. That thing didn't even look like a firework. It looked more like some random stick of dynamite. I guess it wouldn't make sense for a kid to be playing with dynamite. Of course, they're pretty much indistinguishable here.
The CGI wasn't good at all. I'm thinking it might have been intentional. It would have worked better as part of a compilation. It's just too simple. That is a nice song at the end. The final gag's still pretty expected.