So apparently customers did incorrectly take items off shelves which had yet to be priced. This is clearly not correct.
An extra check to validate the price is set has been added to stop this insane behaviour!
Other than that, it is clear that allowing incorrect change or card payment values only in the customer favour is a pain point.
Now the exact amount needs to be input. We don't want incorrect amounts in the players favour, since that could easily be exploited.
This feels like the best option.
Hopefully this makes the experience better.
We are still improving and adjusting things based on more feedback.
So please continue to let us know so we can make this as fun as possible.