it's a cool concept. I like the theme and the color.
here are a few idea that might help make it better :
1) remove the dual health / battery bar and replace it with only one that represent how close I am to die or to succeed.
2) allow me to actually win the game by escaping the black hole if i have a big enough strike ?
3) instead of difficulty that change the speed of the game, allow me to do more than addition with a set of check box that enable or disable each operation from appearing. and make the game run faster and faster as i get closer to escaping the black hole
4) when I break an asteroid and get the bonus, either they magnet to me or its actually possible to catch them all because it feel like the missed bonus feed the black hole and actually make me loose.
5) lower the horizon of event because I have barelly the time to see the number AND FIND THE FCKNG button that i need to press that they hit the line
6) allow to play with tactile screen instead of keyboard
7) when i press the jkl key it highlight what answer i'm selecting and ONLY validate the answer on key release instead of press
