An interesting idea.
Enjoyment: I like Sokoban puzzles. These weren't particularly hard, but that was quite relaxing.
Concept: The idea of open world Sokoban is very interesting. Hope you do more with it.
Presentation: Nice, clear, retro graphics. Amusing story. I think I reached the end, but there was no game over screen.
Use of the Limitation: At first I thought you'd cheated by sticking a lot of levels next to each other, but then there were branching paths, a loop, and a locked door. You delivered on the "open world sokoban" concept really well!