The game currently has only 7 levels. They play on a 7×7 grid (9×9 if counting borders).
The game is written in C and compiled using CC65. It is written for and was tested with a real Commodore 64.
I called it Sokoban64, even though the crates and goals disappear when succesfuly placed.
Public release will be made when I add more levels. A demo video should be also released on YouTube.