Hi there,
This is a game I've been trying to get my hands on for a few years, but with no luck. However, there is an info page and video I've found.
It's a keychain LCD version of the classic puzzle game Sokoban.
Not sure if that is enough to go on, but the gameplay coding should be pretty simple!
Love what you're doing here, discovering RetroLab was a fun surprise!
-Tom
Info: https://sokoban.fandom.com/wiki/Cho_Sokoban_55
Gameplay video: