The screenshot might be more compelling if it were of something like a tooth chart. Based on my interactions with doctors, I'm not sure they care about what their schedulers' screens look like.
They look great. I think there should be a bigger distinction between tap and hold, and a larger emphasis in general on the gesture rather than the hand.
If you zoom out to 50%, that's about how big I would expect them to be on a phone, and some of the gestures (especially tap vs. hold) start to blend together.
I agree with this. I could see myself signing up, getting one kit, and cancelling. Repeat every couple of months when I actually find time to do the brewing.