Fly through space, fighting an army of kamikaze alien spaceships, and defeat the alien mothership. Increase the difficulty for a more challenging space adventure.
The picture below is my outline/wireframe of the game's screen flow.
The core mechanic involved follows:
- Wide-open game-space
- Invisible boundaries around the game-space
- Aliens and bullets will disappear if moved past the boundary
- Player is confined within the boundary
- Collision Management
- Enemy Bullets
- Player Bullets
- Alien Kamikaze Impact
- Pickups
- Enemy Spawn Management
- Types
- Special Attributes
- Spawn Rate
- Damage Caused
- Bullet Management
- Enemy-to-Player Impact
- Player-to-Enemy Impact
- Damage
- Speed
- Pickup Spawn Management
- Types
- Amount
- Frequency
- Player
- Mouse Controls
- Restricted to Y movements
- 100 Hitpoints on all difficulties
- Loses Hitpoints when struck by Alien Spaceship/Bullet
- Damage received modified by difficulty
- Will play a defeat scene is play is defeated
- AI
- Alien ships will rush towards player in a straight line.
- Alien mothership will remain in place and shoot the player
- Alien mothership will track player movement and adjust shooting accuracy on higher difficulty
- Pickups
- Pickups spawn after a certain amount of score is earned
- Score requirement for spawning increases with difficulty
- Health
- Recovers all lost health instantly
- Much less likely to spawn on higher difficulty
- Power-up
- Reduces damage take
- Increases damage done to mothership
- More likely to spawn on higher difficulty
- Mega-Kill
- Special rare pickup
- Kill all enemies on-screen
- Will be given score based on how many enemies killed
- Alien mothership immune
- Never spawn on Easy and Normal difficulty
- Game Difficulty
- Easy
- Enemies small in number
- Health Pickup much more frequent
- Power-up pickup less common
- No Mega-Kill pickup
- Normal
- Enemies average in number
- Health Pickup less frequent
- Power-up pickup more common
- No Mega-Kill pickup
- Hard
- Enemies large in number
- Health Pickup rare
- Power-up pickup common
- Mega-Kill pickup will spawn
- Survival
- Enemies large in number
- Health Pickup rare
- Power-up pickup common
- Mega-Kill pickup will spawn
- No winning conditions
- More than one Alien mothership will be fought
- Scoring
- 10 points for an Alien Ship kill
- -10 points for letting an Alien Ship escape
- 100 points for Alien Mothership kill
- Kills from Mega-Kill Pickup counts
- Winning Criteria
- Alien mothership is destroyed
- On Survival, impossible to win
- Losing Criteria
- Hitpoints reached 0
- Lost 200 points in total due to escaped Alien spaceships
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