Had a LOT of fun playing this. My only problem is with the difficulty scaling. At first the scaling felt awesome, but after having figured out the strategy, it seems that it's pretty much impossible to lose. In fact, once you have a lot of points, you can AFK for a very long time without losing, since it seems that the loss condition is your points reaching zero. I think I would tie loss to the number of customers waiting for you instead, or to your score falling a certain amount below the highest score you got during the run, and I'd maybe introduce an extra lane in the late game and speed up the difficulty scaling from there
Other than this the gameplay loop is super good I love it so much. The ice cream machine's mechanic is perfect