Coursera 2D Shooter

Added remaining lives counter to UI

Player sprites update based on remaining lives

Player gains extra fire rate on killing enemies (resets between levels)

Added new sprites for invincible chaser type

Boss (enemy on level 3) has ultra rapid fire mode every few seconds

Added enemies that dont count as kills for the required enemy kills 

Added healthbar UI for boss battle

Created by: 

Rózsa Balázs [YCW3LU]