There are some great puzzles here! One thing to bear in mind is that sokoban is way more fun when there's an undo move button that lets you go back as far as you need to.
As the levels become more complicated, the lack of undo becomes a real friction point, partly because it's easy to produce a fail-state accidentally, but more because starting a level over can feel very punishing when you're close to a solution but have made a small mistake.