Version 1.1

Added:

- Multiple difficulty modes with different score multipliers (Easy - 1, Medium -1.15, Hard -1.3, Hardcore - 1.6)

-Now every minute difficulty (Speed of asteroid generator) will increase by 0.05 (On Easy starting speed is 0.5 so every half a second asteroid is spawning)

-Now every minute super asteroid will spawn (Half of minute on Hardcore)

-Added immortality after getting hit for 0.88 sec

Changes:

-Menu button Help and About is now Controls and About

-Every minute score boost changed from 250 points to 300 points

Bug fixes:

-Fixed potential bug when asteroids don't disappear after flying out of field of view