The interface is slow, and when you try to shoot the highest enemies and pull back to full power it resets itself which due to the slow nature takes you forever to get another shot ready. Also 'the ball cannot pass the left side'.... I'm not sure why I'm getting the message, I'm shooting to the right... Lastly the music could be longer, or different altogether for my taste.
You should just update the game, don't keep reposting it... This is the third of fourth time I've seen it posted.
The actual game is okay, but it seems to keep changing every version you post. I think you probably should add some shading to the planet, because it is just flat colour which doesn't match the rest of the game.