Hey, thank you for trying out my game !
I played quite a bit of Tapper (the game I'm heavily inspired by), so I already knew how things worked.
If I was better organized and had more motivation during the jam it would've been nice to put like a little cut-scene while starting to show the bartender filling and serving a drink to a customer. I think that would've been enough to showcase the goal of the game.
I also scrapped some features like the different levels/customer bahaviours (some customers could throw an empty drink back at you for a refill) which would've added some much needed variety, it's a bit flat at the moment... ^^'
But I agree with you, the base concept is simple but quite addictive !
Be sure to check out the original ("Tapper" from 1984), if you want to get more of that type of game.
Have a good one ! :)