Also, it could be nicer if the player is allowed to "drag and draw" a whole pipe of "logistic route" over his/her cells, effectively adjusting multiple transfer routes for multiple cells, and/or even allowing adjusting routes with drag boxes.
I agree with jc66266's view. In fact, I quite like this game probably over similar minimalistic RTS games like Nano Wars because it less (repetitive) real time actions have to be done to win a game, but arrows made automatically taken away and have to be added again and again doesn't make the game more interesting - the player will just consider it as repetitive work that shouldn't be taken by themselves, rather than a strategy move. However, the game could become too easy if the arrows are not removed at all. Maybe some more features should be involved to add complexity that pushes the player to change to "logistic routes" from time to time will make the game more engaging - I'm looking forward for a sequel!