I saw this for the first time recently.
The film moves at a slow pace but doesn't get boring. The bleak photography along with the non dialogue heist n the final scene gives the film a very serious tone.
The muted heist is inspired by Rififi.
The camaraderie between the two convicts, especially when one of em says that we have seen worse gives u that ominous feel.
The requirement of a shooter in a heist n its reason will surprise viewers.
The dream sequence is one of the most creepy n claustrophobic one.