The art style is dope and the animation is pretty good but it's pretty predictable and the smoke effects look kind of slip-shod.
Do you use flash to animate? were you using the "soften fill edges" tool to create the smoke? because if so you needed to add more steps and pixels to make it look fluffy. Right now it just looks poorly rendered. Also the smoke clouds coming out of the pipes are stretched in weird proportions.
The art style ultimately carries this as being the strongest point of focus. Keep it up!