Demo
The demo for Box: The Game is available now, it contains 5 levels to try out, it also has a colour blind mode because everybody deserves a chance to have fun!
Update
At the moment 30 levels have been completed for the full game, here is a screenshot of level 30:
Release date
The release date is not yet known but it is planned to somewhere in Q4 2018 or early Q1 2019.