Thanks for playing my game, and for writing the comment. Yeah the art definitely leaves a lot to be desired for sure, something like replacing the wall to be more brick nature and the floor to be more dirt pathing definitely would have been the better way to go.
As for the level you got stuck on if you head straight down from the point you are in the picture you should hit a wall before you reach the bottom, there is a horizontal line of wall not connected to the outside wall, hopefully that helps