A fine display of atmospheric gloominess and despair, this artistic effort is best appreciated scene by scene, as the full package is much less than the sum of its parts. We seem to observe the monochrome world through the lens of Howard's fever dreams, never certain of what is really happening vs mere illusion. The whiplashesque presence of Wake maintains the vibe of choking frustration as Howard struggles to keep up with his impossible expectations. The overarching theme seems to be substance abuse as a coping mechanism for dealing with oppressive authority, which is likely the explanation for Howard's delerium.
The theme of nautical supernature is ambiguous in the same way as the devil's in the VVitch. We are never explicitly certain of the existence of the siren, or of the seagulls' sinister machinations. After sneaking a look at Wake in the lighthouse at night, Howard never questions or brings up the slimy tentacled apparition he observes there. In the final scene Howard gazes into the lighthouse's lantern and screams exaltedy before tumbling down the spiral staircase. It is left to the viewer's imagination as to what he saw, as well as Wake's behaviour in its presence. This ambiguity, while apparently intentional, comes across as a lazy method of forcing the viewer to do the work that more detailed exposition should have done. An atmospheric depression-immersion that holds a unique place in cinema, but which could have used time taken from Wake's 5 minute cursing rant to better craft the viewer's understanding of the strange, bitter world.