That was fun for a bit! I liked the different planet designs. The challenge with designing this type of game is that the faster the player goes, it easily becomes impossible to avoid obstacles, basically rewarding players for making slower, more tedious progress. A good way around this would be to measure the high score by maximum speed rather than the number of planets passed.
Also I think I went too fast (there should be a screenshot below, message me on Discord if you want to know more)