Edited shield variables.
Moved shootTime to constructor parameter.
Update README.md
Created Enemy class.
Created Enemy array in game.
Added new spaceships.
Added Enemy to the game (and it shoots).
Added bounds and changed resolution for Desktop and WebGL.
Enemies can now be damages (and so can the player).
Score counter now works.
There is now a working high score system.
No need to make sure.
You can now go back to the main menu and play again.