Well better than part 1 (Andromeda). The background is much less distracting, there's much less jellyfish that you have to wait for, powerups were added and the boss was spectacular. That said like part 1 it still runs too fast on more modern computers which makes it more difficult, especially to beat the creator's score which again is used as a basis for your letter grade. Also when the boss takes the form of Triangula you can go over/inside it without dying. Probably an oversight? But then again having that advantage helps counteract how tough the boss gets at that point due to the game speed.
This Ball Revamped (Andromeda and Gemini) could really use a remaster though. Not only to fix the game speed and make the background in Andromeda less distracting, but also to merge them into one game as originally intended. After finishing Andromeda and seeing our score we'd transition straight into Gemini, although we'd still be able to start from Gemini to preserve that option. Throw in those bonus tournament (week 1) levels so that we can choose to play them from the main menu as well. Compared to when you first uploaded this game, the file size upload limit has gotten much, much higher. You'd easily have enough space to put all of that into one game.