I wasn't completely sold on the controls at the start although I think I got better once I realized there's a rhythm to it. I didn't get very far into the "deep space" area but I can already see how the gravity wells and tunnels would make the game great for speedrunning.
It's a cool concept, the storytelling explains the gameplay well and adds to the charm, plus all the characters are very cute. The graphics and music are great as well, good job!