SOKO - Another Sokoban Clone

Here is an introductory post on topic of logic puzzles. Feels like a pilot to series, but forgive me avoiding to establish such series yet, too soon to commit, heh. Here, again, just as I love puzzles. Love to play them. Love to create them occassionally... only, that was never more than hobby, and here, and again, continued. Without such interest I probably would never meet Sokoban, but yes, it is well known at that niche, not easy to skip. As it is fairly simple by rules and gameplay, I already made a clone of it years ago... and also managed to lose it. Only because of that - I made it, again. What is it about? The game's premise is... you are in role of warehouse keeper, having task to set some boxes to designated target positions. Warehouse is bit crowded, have boxes, have wals. As box is heavy, you are able only to push it, not pull, and also as they are heavy, can't push more stacked boxes at once, just one by one. As a player, you command keeper from bird eye perspective, seein