Quote from Compiler Softwares homepage: “Compiler Software is a group of friends whose main goal is to create new games, basically for the sake of developing them.”
Compiler Software made a Sokoban clone for the ZX Spectrum(!) in 2006. Developed by Miguel Angel Garcia Prada, Javier Vispe Mur and Federico J. Alvarez Valero.
The included levelset with 99 puzzles was partly original levels, partly levels borrowed from David Skinner and Evgeny Grigoriev.
You will find the original puzzles in the collection Suitcase 03.
Level 24 (original) is unsolvable. The wall at the arrow probably was not intended: