Control Problems
To begin with, the controls that you ahve provided above are the other way round. Blue is red. Also if you hold the end key (down) or Home(up) and press delete(left) the blue character truns right. There is no change in speed at all for the blue character. The red character has no change of speed when turning right and holding down. If you shoot the left hand wall with the red character you die instantly. If you repeatedly tap space no damage is done to the other character.
It seems you ahve made a basic start to a game but there is alot to do before it is actually playable. Don't give up. Use the points i have made above to create a version 2 which is actually playable.