Schematic and PCB review request BLE Battery Powered Sensor Device

[billben6577]

Hi all, I would like some feedback on my BLE Sensor device which is battery powered and includes a battery charger please. The top layer is signals + a 5V and a 3V3 pour, the 2 inner layers are ground planes and the bottom layer is signals plus a ground pour. The MCU is an E-Byte Nordic nrf52832 module, and the sensors included are a temperature sensor and a photodiode which is amplified by a transimpedance amplifier. Battery is to be charged by 5V via a USB-C cable. I've included a circuit with the battery charger IC such that when 5V usb is connected the battery isn't used and is only charged. Screenshots attached. Any feedback is much appreciated

[Renate]

Why the whole analog uncalibrated temperature sensor?
Even the light sensor could be digital.
Why Q4 and Q5?

[negativ3]

Has your circuit been prototyped as-is?

[billben6577]

Q4 is for reverse polarity protection incase the battery is connected the wrong way around, Q5 is used so that if 5V from USB is connected, and the input of the inverter is grounded, then 5V is connected to the input of the LDO instead of the battery thus the battery is charged while everything runs off 5V when the USB is plugged in. If there's no 5V then the input to the inverter is pulled up, the output is a logic 0, Q5 turns on and the battery is connected to the LDO input. What do you think in terms of general layout, power pours etc? I've realised already that I could use thicker traces for power and need some stiching vias, I have kept analog and digital separate with the ADC on the boundary between the two