This is very interesting. If i may, i would like to make some few possibly constructive observations. To make it more captivating, i would change the tutorial by making a playable tutorial in wich you can learn and play it step by step, making it less boring to learn. Secondly, i would make the J key also able to skip the "you died" scene, to make it more dynamic for whoever is using the keyboard instead of the mouse. I also would make it more colorful and maybe work a little bit more on the art. Another idea is to make a gradual difficulty, where the more planets you pass by, the harder it gets.

That's it, and congratulations, i found the game very creative.