Fireworks is a fireworks thing. The first thing you'll notice is that you can't press "P" to play because the thing is set to only load from a swap world, for some reason.

Once you find the fireworks test board, you can press keys to make fireworks-colored built-in Megazeux explosions appear over a set of turrets in a crudely-drawn board. The fireworks make a "ding" noise when they go off.

Not even worth a download!