I interpret it as an endless Cycle. Fight, Buy, Go back to home.
Really interesting concept. Makes me think that, in a way, being a Magical Girls can also be considered a Job without being paid.
Do they choose to be a Magical girl? Or are they obliged to do it by a higher power?
Anyways, something that I feel would have completed this is being able to sleep. And by doing so, all the game repeats itself.