No more mouse banging!!!

Changes in controls:

After the initial review from some people, I realized that having mouse click as an option to fire was probably a bad idea. Having to click mouse rapidly is not good for mouse and your health too. 😅

So now I have changed the controls to space bar. You can move your spacecraft by holding space bar. This will move the spacecraft towards mouse pointer. Also, holding space bar will keep firing at a steady rate. You can still go kamikaze on space bar to fire more frequently.

 Enemy spawn changes:

Someone noticed that sometimes enemies spawned too close to player, leaving no time for player to react. I have now fixed this and not enemies should not spawn too close.

Difficulty curve changes:

It was also notice by some people that the difficulty took some time to increase initially but later it escalated quite rapidly. I have now addressed that too. Enemy spawn speed will not increase more gradually.