“I got this little thing to experiment with ESP32 without spending too much.
Using it with their UiFlow interface is pretty easy and doesn't even require a physical connection if you want to program it through Wi-Fi via their server. All the basics are here and allows to do simple stuff like using the LED matrix, button and accelerometer, but it's a little trickier to get to use and debug the advanced blocks this way, such as HTTP. Some features are also missing from this interface, such as BLE or sleep functionalities : you'll need to use the Arduino IDE with ESP32 libraries for these (Haven't tried directly with MicroPython)
I now use it as a BLE single button keyboard for my Raspberry Pi (powered through USB), and it works as intended !”