we aren't sure what kind of currency will be in the finished product, we are thinking of using a fictional currency but aren't sure, and yen takes up a lot of space as even a small number is still going to be 4-5 digits long. We are open to ideas and suggestions!
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I think a fictional currency matched with a fictional setting that mimics Earth would work! Not sure how fleshed out the world is, since I've only completed the demo, but it doesn't seem like it needs to be tied down to a specific geographic location. Especially since it seems this will be more focused on character interactions.