Remote for Steerable Robot Drone

This is a remote for the "Rocking Body Walking Robot Drone #5 steerable version " I posted earlier:
https://www.thingiverse.com/thing:3102186

The remote wasn't necessary but I thought it matched the look of the robot better than a universal TV remote. It uses an Attiny85 programmed with the Arduino IDE.

The input is from a digital thumbstick sold on Ebay as "Navigation Button Module 5D Rocker Joystick Independent Keyboard for Arduino MCU". The thumbstick has to be de-soldered from the board so it can be used in the project. It has left right up down and a button when the stick is depressed. The button isn't used in this project.

The power supply is is made from two 2032 cells wired in parallel for 3 volts. I did this because 6 volts is a little high for the Attiny. Putting the batteries in parallel also allows more current for the leds. I modified one of these battery boxes from serial to parallel:
https://www.banggood.com/CR2032-Button-Battery-Holder-Case-With-OnOff-Swi