BOSS UPDATE (Lots of changes

-Fixed the enemy spawn count resetting to the wrong number after starting a new run without closing the game

-Fixed the manager performing a useless check if enemies exist even though it already checked if enemies exist

-Fixed the issue where enemies would not have randomized rotations when spawned

-Enemy spawn count at the start is 20 instead of 10

-Cleaned up manager script in general to get rid of redundant code

-Boss added to the game

-The chances of the boss spawning becomes more likely each time an enemy dies. Value resets after death.

-New bullet added

-Camera zooms out when close enough to the boss

-Boss health scales with the current power of the player at the time it spawns. It will not scale afterward

-The size of the asteroids are now randomized

-Most sprites have now been given a new material and shader

-Enemies now flash when damage is dealt to them

-Sounds that play a certain distance away from the camera will not be heard.

-Enemy's bullets now gets destroyed the moment they die

-Added a boss health bar

-Enemies give different amount of points instead of all being the same

-Magnet for minerals activates if the player has stopped shooting for 1.5 seconds. The magnet's range is small

-Tutorial text no longer disappears when the camera is a certain distance away

-Added extra tutorial text for level 2 and 3