Even after reading the instructions, I had some trouble understanding how to play, mostly because I wasn't sure about what everything looked like, but after losing once, I got it and the fun started. I managed to survive a full 3 minutes during my best try 😁
I think the difficulty is well balanced for a short but focused run, the bonus lives are neither too rare nor too frequent, and the bonus black hole add an healthy dose of risk and reward.
Your game could easily be expanded with more power-ups, like something that temporarily slows down time and invert the colors, or make several rythm based levels where the black holes appear in time with the music.
I would have like a Quick Restart button rather than being sent back to the title screen when I lost, but besides that, I had a blast. Great work!