I don't like the fact that they had added a moral objective to a character like Spike which is in fact a bounty hunter so saving the world does not enter as an objective but this might be but it might be put into question the fact that saving the world includes saving himself when we are talking about a global virus supposed to wipe out humanity.
The film itself is based highly on American Jazz and film-noir classics, the animation is able elaborate this. Still, the position of each character during a climatic sequence is set up exactly like a spaghetti western. The physicality of an anime character has very large eyes, so this increases the elongated stare that builds up the tension. It doesn't exaggerate with the simplicity of Japanese anime, it's original.
Spike Siegel: one of the coolest, most bad-ass, hottest, character ever made. The movie itself though, a bit feels like a repetition of the (spoiler alert) Cowboy Bebop's last episode. However, the specially made characters for the movie were strong enough. At least enough to sympathize with their ending. ..along with the closing song..
you just gotta knock a little harder to get the Bebop mood into your system. basically, this is an extended episode, but the show is great already, so no problems here. perhaps it reeks of self-congratulation and other terms of the like, but i'm okay with films trotting towards pretension if they're animated. it bangs, and also does not bang.