0.2 - Music volume setter bug
Level 15 showing before ending


0.3 
Expand on high scores system (names, more scores);
Add unlockables
Add power-ups
Demo mode
Better graphics all around
Varying graphics for levels
Animation for the aliens and shields
Particle explosions

0.9 beta

1.0
Final bug fixes, need proper beta-testers

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Unlockables
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Complete Level 1 - "Congrats! Your first unlockable" message
Complete Level 2 - Level 2 and background free
Complete Level 3 - Level 3 and background free
Complete Level 4 - Level 4 and background free
Complete Level 5 - Level 5 and background free
Complete Level 6 - Level 6 and background free
Complete Level 7 - Level 7 and background free
Complete Level 8 - Level 8 and background free
Complete Level 9 - Level 9 and background free
Complete Level 10 - Level 10 and background free
Complete Level 11 - Level 11 and background free
Complete Level 12 - Level 12 and background free
Complete Level 13 - Level 13 and background free
Complete Level 14 - Level 14 and background free
Complete the game on chicken mode - Photo of Spike the Chicken
Complete the game on easy mode - Mini-game: Invaders Pong
Complete the game on medium mode - Mini-game: Invaders Breakout
Complete the game on hard mode - open-ended mode opened where game does not end (possibility for unlimited points!)
Complete the game on insane mode - Ending unlocked
Reach 5,000 points - Retro graphics
Reach 10,000 points - Original (0.01) graphics
Reach 20,000 points - Original (0.05-0.2) graphics
Reach 50,000 points - Silly graphics
Get 5 lives - Jamyskis short demo
Complete the game without losing a life on easy mode - Naughts and Crosses screenshots part 1
Complete the game without losing a life on medium mode -  Naughts and Crosses screenshots part 2
Complete the game without losing a life on hard mode - Making of Open Invaders part 1
Complete the game without losing a life on insane mode - Making of Open Invaders part 2
Shoot 3 UFOs without touching an alien - cow abduction comedy animation using engine
Shoot and miss completely five times, minimum level 10, medium mode - alien/ship wild-west standoff animation using engine
Make a hollow 8x4 square out of the aliens - alien romance comedy animation using engine
Make a 8x4 plus sign out of the aliens - Maths class with the aliens - animation using engine
Make a large cross sign out of the aliens - Alien can-can dance - animation using engine
Make a chequered pattern out of the aliens - Alien disco using popcorn song - animation using engine
Leave the bottom row in one piece - Comedy animation - old graphics meets new graphics
