Hey I did something really similar to you! This was a cool take on the idea but as others have said the controls were quite hard to manage.
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Ah I mean the floatyness! Like holding a key and waiting for the ship to move and being slow to change direction. I prefer when it's more immediate however that being said there could be situations where less responsive controls fit what you are trying to do. Also I think it would be easier to control if the direction keys resulted in world space movement rather than ship relative if that makes sense. Of course this is just one opinion on the matter :)