Looks great! How much optimization (e.g. deep sleep, wake trigger) was needed to get battery life with the ESP32 to where you wanted it? Also curious if the project is running on MicroPython or if you moved to something with less overhead.
Most work was getting the unit power efficient, analog design correct and constructed in a way that’s easily manufactured.
It uses microsamps while inactive and runs on Arduino still. We probably need to rewrite it with esp-idf eventually to get access to lower hardware apis and better memory management.