Here is the UF2 for the factory shipped version of the eye animation. Press the reset button one (or twice) to get the board recognized by your computer as a drive named HALLOM4BOOT. Copy the UF2 file below to the HALLOM4BOOT drive and the board should reset and be running the eye animation.
This UF2 features the eye animation with rainbow neopixel animation. It's similar to the demo featured in the product page hero image.