Difficulty's fine but if I know what the solution in making multiple identical trips is just a waste of time. It's not a matter of difficulty, it's a matter of tedium.
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I don't hate to do routine work in a game (if it's fun).
But as a puzzle game, unobvious solution with fewer routine works may be ideal.
As you said, If you could guess the solution, everything can be routine task.
Solving rubik cube is a waste of time?
It depends on the players intelligence.
Of course,I don't deny this game can be improved in many aspects.