It sounds like this could be an interesting game. It is interesting how many video games operate in a single character format, but that doesn't seem to have been translated to the tabletop to my knowledge. I remember seeing skirmish games with four characters and thinking that felt very small sided even in the skirmish genre. I think that "army of one" style play lends itself well to tropes like super spies (Bond or something like Tom Clancy Splinter Cell), and even horror like Silent Hill. I think there is greater tension knowing you get one shot to complete the mission without the use of sacrificial lambs.