Amigos have a strong white LED flash light in the back, when scanning QR codes you can press ENTER physical button to turn it on. Can be useful to scan paper QR codes in dark environments.
I noticed some of them blink when starting up. It's probably due to a random state of IOs while the device is getting powered up. Sipeed should have used a pull down resistor on the LED transistor driver gate(I checked the schematics and it is missing). Maybe there's a firmware hack to avoid this glitch, but I wouldn't worry about it. The behavior changed on beta14 because now Amigos go to a deeper level o "shutdown".

Another dev, Tadeu created the screensaver. On beta14 I did some optimizations for it to use less resources too. It's useful to grab your attention and don't forget to turn the device off.

Glad you liked the changes!