Burp world

[Lizzie]

Slurp gurgle burp. 
Slip flop slap.
Plunging in the toxic river.
Falling with a clap. 
 
Velvet maze.
Crimson haze.
No escape in sight.
Warts and all. -- cliche
Waterfall. -- you could make a line break between water and fall if you wanted to be either clever or pretentious about it
Candescent yellow light. 
 
Whirlpools sucking down.
Bones cascading in the soup.  -- Cascading into? "In the soup" is more like a simmering, bubbling. The motion could be circular as in stirring, but not downward. 
Pores pouring out more sludge.
Washing down the bend, make a loop. -- make is a weak verb here
 
Sizzle hiss pop.
Crackle fizz snap.
Churning bile.
Dissolved away. 
 
Absorbed into the walls.
Into the pungent brine again a new victim falls. -- don't like the placement of 'again.' The natural, grammatical order is only mixed up for the end rhyme. I don't even think you need 'again' because you specify that the process repeats in the next line. 
And the process begins once more.

I don't mind a bit of vagueness in poems that are mostly about the sonics (to a point, and I think this piece could use a little more in the way of narrative). However, your sonics are all broken up and choppy because of the copious periods. It slows the pace of reading to a crawl, and doesn't let the words flow together. And this is odd to me because of all the water/liquid imagery. 

Good luck with the piece. 

Lizzie