Confusion itself is a great story. Instead of thinking of it as a one-off narrative, maybe think of it as a world, wih new and recurring characters that you can add onto via DLCs. The original Confusion (maybe with some modification) is the core product and remains priced as it is. But now it sets the stage for DLCs which leverage the world building you've already done. Some of the Steam-specific stuff you have could go there.