It was good, but I didn't really see the duality in the game, unless it is linked to the other game. I also didn't get very far before it got repetitive (like the 3rd gold generator)
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yeah, the duality is meant to come into play once you get to the Diamond generation, a screen on the right side (the empty space) will pop up and you get to unlock a "world" but I didn't get to finish the implementations, so even if you managed to get to the part after that, there wouldn't be any added benefits in the duality aspect, as it was incomplete, unfortunately