While this isn't doing much new for the idle game genre, you did do a great job incorporating the coffee theme into the mechanics! Having to choose whether to put your resources into increasing your addiction (and thus speed) or increasing your money to make further upgrades was a nice balancing trade off. I'd love to see some sounds added to the game, simple click noises, and some sort of chime when you reach the top of the addiction bar would go a long way towards helping the game's feel. Overall, nice work!