is another gem of a puzzler by Hellbound, though this was released two years ago and have gathered little recognition besides an entry at the GMG site.
The name may slightly mislead as there's more to it than sliding blocks. Probably closer to resembling Chip's Challenge than Sokoban, your character can carry a maximum of one item which is the basis of all the challenges. Certain blocks need to be destroyed using dynamites, while others are to be removed through the use of a switch or key.
Do note that the boomerang serves no purpose until stage 21. There's no time limit to restrict the player from experimenting, plus none of the puzzles are ever too difficult to solve without a little thought. Progress can only be saved at the main menu, accessible at any time by pressing the escape key. Highly recommended.