Fun game! It is a cool concept, with a nice twist on traditional tower defense games. The space farmer theme with tower reloading with farms and robots is something unique I have never seen before. With some work on robot movement, (help section would be great, because I had to go through it twice to start to understand that they can only move diagonally when there is at least one walkable tile nearby or something), when the robot decides something is ready to refill/farm is ready (ignores towers sometimes, sometimes for a long time (I am guessing this is due to a performance shortcut)),  *a delete button*,  and maybe some sort of terrain randomizer to keep the game interesting.