I really feel that this would benefit from being longer, either a feature or a TV show, with them facing a new problem each week. This would give us more time to understand the relationship between the two main characters and give them more interesting dialogue. These are supposed to be a couple arguing and bickering in the way loving married couples do, but at the moment it's not coming across like that, though it is close. If you work on your dialogue and make them spend longer in these strange and difficult situations, I think you could be onto something. It is an enjoyable read.