Great game but... – The Spearman Review

So the spearman is a great game, makes me feel like a roman ? but the problem is I can't buy new spears. I have the same old black one. My friend showed me this game and he can buy spears but I can't. If anyone could tell me why, that would be great. I have an iPod 6th generation if that helps.
Review by Wolfsharknado on The Spearman.