That was an interesting experience. I liked the tutorial as well, good introduction to the game, though perhaps it could have also teach you how to deal with boss attacks, because that's the only thing I didn't get right away.
But yeah, concept with 2 planets can be easily abused, for example I just set max speed for inner planet and then was just controlling outer planet speed to match with the inner one, so didn't need to switch orbits at all. Though yeah, after defeating the boss I didn't have too much of hp left, so if you would increase boss damage a bit more, you could get rid of this cheesy strat. 🙂