I've only played the first few missions, but the cannon damage both ways seems very negligible and whenever I'm tasked with boarding a ship I can just bull-rush my way right to it and board. Does it get harder?
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The game definitely gets harder than the first couple missions. The first few are just there to teach you the ropes of the game. It gets harder, and eventually you will have to start strategizing more than you do in the first few.