release it
focus on marketing for a while
Treat it as a purely hobby project
Make it into an ethical game experiment
pour a lot more time in, improve graphics and music, add more levels and variety
As someone who's gone through this, put years into a software startup, nearly had it fail completely after spending a lot of my own money to keep the family afloat while I goofed around thinking I was building something great...I feel like there is only one right answer here, and it's just glaringly obvious. Marketing is the thing that needed doing before starting, during the project, and after it's done. Regardless of the trends on Steam, in fact even more so because of the trends on Steam. None of the other options will solve the problem. Releasing it won't help, and making an ethical experiment won't get anywhere without an audience. Pouring more time into graphics will result in greater loss without first gaining an audience.