A HTML5 implementation of the classic Space Invaders game.
This implementation supports one and two players.
The game is playable in the URL: https://toivjon.github.io/html5-space-invaders/
Development blog entry: https://toivjon.wordpress.com/2017/09/17/html5-space-invaders/
Game is split into following scenes:
- A welcome scene, which contains the main menu and score descriptions.
- A "play player" scene, which tells which player should prepare to play.
- An in-game scene, which contains the actual gameplay.
The list of scene transitions:
- 1 to 2, when the number of players has been selected.
- 2 to 3, after 150 ticks.
- 3 to 2, after a level has been cleared i.e. all aliens has been destroyed.
- 3 to 2, after player has been killed and other player has still lives left (multiplayer only).
- 3 to 1, after pressing the enter key when game over text is being shown.
This Space Invaders implementation contains the following features:
- A support for one or two player (turn-based) games.
- Each player has three lives.
- Each level lasts until avatar or all aliens are destroyed or if any of the aliens invades.
- Game ends after each player has lost their lives.
- Player game state is stored when toggling between players in the two player mode.
- Aliens may shoot three different kind of missiles (rolling, plunger and squiggly).
- Plunger and squiggly alien shots follow predefined shoot patterns.
- Rolling shot is always launched from the players nearest alien.
- Game field contains four pixelwise destructable shields.
- Players earn points based on the destructed alien type.
- Alien movement speed is increased after the number of shown aliens decreases.
- Alien missile fire rate depends on the player score.
- Alien starting y-position depends on the level number.
- Flying saucer will be shown about periodically after each ~1200 ticks.
- Points received from the flying saucer is based on a lookup-table and player shot count.
