Really good job! I think it's way too difficult where it's at. I just don't think there's enough speed to keep up with the enemy AI. With that being said, it was such a cool concept. I like the idea of manning your crew to move around with your ship. I don't think '0' should be your clear button, though. Something more accessible for your hands would be great. Nicely done!
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You are right. The people I play tested with the game (after the jam), had to play it 4-5 times before they developed a technique and actually stood a chance at the boss (4th wave). As for the accessibility of the controls, only the up and down makes sense. 1234 (+space) doesn't. And turning the wheel doesn't convey the correct information.