Difficulty Update

This update makes the game a bit more enjoyable.   The main changes are:

• Player ship is faster
• Enemy ships aim to intercept the player ship starting in level 1, and have greater accuracy in later levels
• Enemy cannons use leading fire starting in level 1, and have greater accuracy in later levels
• The number of enemy ships and rate of creation has been adjusted to increase difficulty

These changes have resulted in greater difficulty.  In the past I found it a bit too easy to get to level 15 and beyond.  Now it's difficult to get past level 9.  Good luck!