This is Post-Metal that’s largely moulded after the trinity of Isis/Neurosis/Cult of Luna, although they also have a more Metal quality to their sound akin to Gojira; both bands share a love of emotive, winding leads as well.
The singer has a clear and powerful voice. It’s legible and deep at the same time. It’s a very strong focal point for the band to have and he puts in a commanding performance.
The music is equally strong and commanding though and ultimately this is the real star on Infinite. The build/release nature of Post-Metal is present and correct, although Amniac are probably a bit heavier than some who play this style, with chuggy Metal riffs and Sludge influences thrown into the melting pot.
Amniac seem to have a firm grasp of good songwriting skills and of what makes a good riff. The guitars are very emotive and manage to carry the emotional content well whilst retaining that strong and forceful side.
This is a very accomplished album, especially for a début; lots of thought and skill has clearly gone into its composition.
Give Amniac a listen. Highly recommended.