Great mechanic! Makes for a very confusing and fresh (hah) take on the genre.
It would be really interesting to add a set of puzzle levels where the goal is to clear the board completely.
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Yes! I totally wanted to make puzzle levels. The whole system is there (it's basically how the tutorial works), so I can easily make my own board. The difference however is that the goal is to make one shipment.
But making good puzzle is difficult and it would have taken too much time so I didn't do t. Maybe I will start to design some levels now :)