O jogo está muito bem apresentado, o estilo está lindo, principalmente as animações, infelizmente, acho que faltou algumas dicas, e o jogo crashou pra mim com o erro:
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ERROR in action number 1
of Draw Event for object obj_shop:
Variable <unknown_object>.canSell(102844, -2147483648) not set before reading it.
at gml_Object_obj_shop_Draw_64
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gml_Object_obj_shop_Draw_64 (line -1)
Além de que o debug está ativado, dando pra ver as textures, mas pra um jogo feito em 2 dias, está ótimo, parabéns!