I really liked your game! (yes I managed to die in the tutorial hahahahah) Anyway, what I have to say to help is, maybe somehow demonstrate the amount of life that the planet/boss has, it also took me a while to understand that I should be inside the circle to be able to attack with the space, I kept trying outside and even considered that the game was broken, but luckily I realized it haha. Anyway, very good game! Congratulations on the project!