Dark theme and dark humour in this build since player is order cute victims to the death, but on the other hand there are wide possibilites for an interesting puzzle game.
Character movement bit odd, and sadly there are not much animations like door openings or water drops from the ceilings. Also there are same graphic elements in walls and on the background wall whcih is a slightly confusing to locate collision walls. Also there could be a note when last character is left, so player would be more careful and awared.