Ogre Push! is a Sokoban inspired game created in PuzzleScript. The game builds on the mechanics already in Sokoban, adding more complex and interesting gameplay mechanics to get your brain working. It's not overly difficult, but it should challenge you a bit.
Ogre Push! is completely free for anyone to play, however there is a donation option on this page if you wish to support me monetarily. It helps out a tonne!