v1.3
Updated the graphics on levels 1, 4, 5 and 6
Updated boss fight on level 6
Added bigger explosions with debree
Added new laser power-up
Added hidden power-ups throughout most levels
Added extra power-ups in levels 5 and 6
Added new enemy speed boat on level 6
Added escape key to the menu navigation
Added numerous design and AI tweaks
Fixed running soldier AI
Fixed jumping off ropes
Updated icon
Fixed rare crash on submit high score
