Update 0.9.3

This week's update brings the particle effects, some changes to gameplay and some tweaks to keyboard controls. Bullets will blow up on contact, stars will explode and large stars now can spawn up to 3 smaller ones upon death and the spawn rate is increased. With this slight difficulty increase I've also added some new ranks and I've tried to improve the feel of keyboard controls.

Update log entry in the README: Update 0.9.3:

• Game: Added Particle System
• Game: Added Thrust Exhaust
• Game Added more ranks
• Enemies: Increased small enemy spawn chances on large enemy death
• Enemies: Increased possible spawn number of small enemies on large enemy death
• Input: Increased Horizontal input gravity for buttons