Here is a simple formula to price anything: Overhead + Profit + Salary / Number of Units or Hours you plan to fulfill in a year.
Overhead is anything that was a cost, including other people you may have paid for work.
Profit is a flat % tacked on to Overhead, this is your profit margin and should go back into the business.
Salary is what you want to earn for operating this project. This is what you take home. Anything else goes back into the business.
EXAMPLE
Overhead: $200
Profit 25%: $50
Part time Salary: $2,500
Total: $2750
Units Planned to Sell: 200
$2750 / 200 Units =
Cost Per Unit: $13.75
Note, if you're planning to try and work with traditional retail/distro you'll need to factor in that the retailer will have a large margin added to the end of this. With a cost already where it is, you can see how being able to produce games at scale is important for traditional retail.
This isn't just useful for pricing, you can use this formula to determine if a product or service is viable or not. Please note, I mean viable economically. Your game is 100% viable and deserves to be made, it just might not be destined for a life flourishing under Capitalism :-D