Alchemist play technical ambient/death metal similar to Neurosis, though not as slowly developed. The music is very textured and incorporates a lot of different influences. Each release shows the band improving in their musicianship and songwriting.
Starting with Austral Alien, Alchemist seem to be throwing off their death metal roots and focusing more on the ambient, textured elements of their music. It's still somewhat heavy, but not as crushing as their early music.