Okay, so I made some graphics myselfwith your file names and put them in the data directory. You have many problems within the game. You have three seperate wall actors (2clones under everything else, for no apparent reason). I adjusted all the physical response settings, and you are right, nothing seemed to fix the problem... My next step was to remove your wall object completely, and add new objetcs and see if the player would repsond to them, which it did... So apparently, it has something to do with how you went about tile'ing your wall object, not sure what though... I made a new object with a 20x20 blue square as an sprite, tiled it like a maze & added a physical response for the player, and it works fine...
So remove all three of your wall actors, and start a new one from scratch. Dont click and drag when tile-cloning, place each one next to the previous, and try it that way.