Supposed to be more ashes, rather than smoke, but the fact that it's reading oddly is a sign that it has problems regardless :P

it's very nicely pixeled but smoke doesn't behave like that :)

I actually like the falling smoke. Not too keen on the flash though, but very nice :D

Awesome!  

Yes, I agree with Opacus. This looks more like a water splash in fiery colors. If you get rid of the falling parts of the explorion, it would be great! (but it's good anyway :-))

It's pretty good, but the part where it falls down really doesn't make any sense to me. After all: Hot air rises, and it's an explosion! I've never seen an explosion fall downwards half way through. I say study some youtube videos about explosions.
http://www.youtube.com/watch?v=wcmmLvAYqkI
As you can see there: When explosions have bursted at the highest intensity, they kind of curl upwards.

that is sooooooo cool.

A bit quick though it's still good.