I am kinda OCD about these games so yeah, also I intend to criticize so that you can improve. I don't know if this is your first game, but the games looks good! The only thing is that the game feels an awful lot similar to Red Remover, But this game is unique in it's own way, Obviously you can't say much about a game that's only been up for a day. But good job! :)
Some Suggestions(which I think you already know about them) : -
1. Song Pause/Mute Button.
2. An Instructions or Objective Detail?
The only bug I currently found is that, it can give you the win even if the "thing" falls off after touching the platform. So you might wanna fix that, but again other than that, Good Job! :3
The game is coming along very nice. I also had this brilliant idea for you, What if instead of deducting score for wrong color shots, trying making it so that the score is deducted everytime you move, like a fuel. So once it goes over 1000 it will be start to be used as a fuel for yous spaceship's movement thus making it more challenging, also nice music in the background :)
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lol yeah, it's his first game, i think. i'll see what i can do :P