Awesome puzzler, congrats! Even more awesome, it's a sequel, now i'll go play the first. Huzzah!
I found a few bugs : lvl 16, if the player go to the left it enters the wall and it can break the game (freeze, need to reload the page) also you can push the little green slime into the wall on its right finishing easily the lvl. In the lvl where there is a row of 5 slimes you can make the two slimes on the right jumping on the same tile. I finished the games (played it on crazygames) and when i reloaded the page, all my progress was lost... so could not find other bugs or find secret passages if any.
Thank you for this game, hope it's a trilogy (or more)
oh, i forgot : it would be awesome if you provide (infinite) undo/redo, it's a bit boring when you have to replay all the level for just one mistake.