Slowly progressing, small hiccups here and there

My second solo Ludum Dare ever is progressing slowly, but the core gameplay is almost done. As the last thing for the day I set the grass tiles become null when the player object goes over them, but for some reason the cell 0,0,0 doesn't want to do that. Considering that I'm not a programmer it's looking ok, hopefully will have time to work on the graphics and add some sounds too.LD47StuckInALoop_WIP1.png