I have upgraded my previous tiny homemade Adruboy clone I called Ardubaby to Ardubaby 2020.
I replaced the 0.9" OLED with the 1.3" one.
Then simplified the circuit a bit by removing the extra battery charger board.
I replaced the 5V LDO regulator with a 4.2V one.
The LIPO battery can still get charged by connecting to the 5V of the USB port (i.e. RAW on the Pro micro board.). The battery protection circuit builtin to the battery will protect it against overcharging.
Here is the demo video.