It means that if I buy it, I have to buy a copy when I develop the second game? In that case, I may not buy it. Considering the cost, I may find someone to draw a set of icons with the same style. Our price here is $1, so I can't use these icons considering the cost. Because the games I play are small, there may be a lot. In that case, I will pay a sky-high price, and the overall income of the game may not reach the price of icons.
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If your game hits the criteria outlined as a "successful game" as specified in the licence you need another licence, if it however doesn't hit the criteria then it's ok to reuse them. With 50 copies sold of a 1$ game, the criteria of a "successful game" are not met, but please read the licence. Every case is really clearly stated in there.