you're the first to say it's easy. Yes, the ramming mechanic and crashing into each other was intentional. The third wave launches 6 small enemies which i hope to initially overwhelm the player. However, the next (last) wave is a 1-on-1 with the boss so you cant use that tactic.
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It's true that the last one is 1-on-1, but, at that point, my crew is so big, that even having received a lot of damage, I could recover easily.
Maybe I felt the game was easy because I've got a lot of experience in this kind of control (Overboard! by Psygnosis), so I had to focus only on how to move my crew from one function to the other.