The visuals are good, and I had fun for a while. But then I realized I could kill enemies as soon as they appear, and since the difficulty does not increase, I could play forever. I think this game needs more variety to enemies, preferably those who require you to switch.
I also didn't realize the red ship is an enemy until I read the description. Are you planning to add more stuff that requires this setting? I know "red ship shooting at you when in full health" is missing content, but I think that will only add minor annoyance to the game(you can prove me wrong though). Maybe controlling the red ship will make enemies behave differently or unlock new areas. Or, if you can't come up with good reasons, you can scrap the idea of bounding to the enemy ship and make the game about two ships with different abilities joined together.