It's good, but...
There are a lot of flaws. First off: an actual gameplay bug. If you hit (or maybe go under) a tile that forcibly moves you just before you die; then you'll respawn already moving. However, my big complaint is actually with the difficulty.
First off, I'm not saying that really difficult is bad, I did have fun. However, having to click on a ball moving at high speeds is far more difficult than it needs to be. The detection box for the ball is a bit smaller than it could be, and it creates a cheap challenge either way. The puzzle element of this game seems to be planning, and the skill element is about exact timing and aim. And that's great! I really enjoyed that part, the zero g options forced you to think about what you were going to do. The issue is, for the best aspects to this games challenge, the mouse doesn't add anything. I'd have had a lot more fun, and probably managed a lot better if you could just click ANYWHERE and then aim and shoot. There isn't anything else on the screen to click anyway! You'd still have to time it right, and know exactly where your ball is, just to aim it. There just wouldn't be any annoying moments chasing the ball with the cursor.
Next off, some of your medal felt ridiculous. Complete 1000 levels? Really? And only 50 points even then? Even though I really like this game I'm not going to play and replay it that much. I know that there's a point limit on medals, but given the difficulty of this game pretty much all the ones related to playing the game felt disappointing.
Next up: The user interface. From what I've seen, there's no real way to check just your record times and shots on the various levels. Also, all the menus felt really bland. I get that they were thematic, but I could barely see some of the options on the main menu at first.
One thing that bothered me was the password system. No other game on this site (that isn't well hidden, or actively multiplayer) requires that to my knowledge. I can understand for the level creation/sharing/whatever you plan to do with that, but do you really need my email address before I can SAVE MY FREAKING PROGRESS? Even after I signed up (Afang username btw.) I didn't get any notice that things actually saved, from what I could see nothing was actually different!... What I'm getting at is that it should be easier to avoid losing 3 hours of progress on a game like this; and much, much easier to KNOW that you're avoiding that.
Anyway, that's most of what I had to say. The levels were interesting, cruel, and much in-between. I liked the concept, and the execution wasn't even that flawed. I even managed to get really into the game (my blood pressure will rise every time I see left facing arrows for at least the next few days.) There's just a lot you could work on.
Oh, and, *ahem*
I DIDN'T GET ONE OF MY FREAKING MEDALS.
Par shots on all the main levels? I actually got that, and it wasn't easy. You can check my userpage, or profile in your game (Afang.) I've gotten all the component medals, but it just didn't show up. I really, really hate it when medals glitch up, because often there isn't really a way to go back and try again. If you could fix that, very soon, that would be great.