The hopping snail customer had me laughing, it just looked so silly.
In regards to the game I think there is a lot of polish missing. Dropping the weight is super random as the customer can turn around and catch the player while the drop is in mid air, nothing you can do about it. It also doesn't punish you besides costing time. I would make it optional and would give more of an idea how distracted the customer is. That way you can choose not to drop it with customers who are more attentive. It could be like a push-your-luck system. Getting caught could then mean you get deducted on what the customer pays instead of them running off and you just start again with a fresh customer.
Finding out the weight is also very hard in the short timeframe and the very slowly reacting scale. Also it seems there is a bug with the shop. When I finally managed to swindle a customer and made 8 coins I went to check out the shop but it said I had 0 coins.
There is potential here, but in this form it's very rough so keep at it ! :)