Re: good html 5 and _javascript_ speech tutorial
About multiplayer from _javascript_, I don't have a working example, but it would probably use WebSocket:
https://en.wikipedia.org/wiki/WebSocket
A server can be done for example in Python with Tornado:
http://www.tornadoweb.org/en/stable/
https://github.com/hiroakis/tornado-websocket-example
About an accessible space invaders, just thinking about the essence of the experience of a space invaders game (in my opinion):
- the invaders are progressively accelerating (each time an invader is destroyed, I think)
- the speed of the music is linked to the speed of the invaders
- there are progressively destroyable "bunkers" that can be used as a shield but have to be pierced by the player to create a kind of an arrowslit to fire through while being relatively safe
- the invaders are descending each time the wave reaches a side, so the player is tempted to avoid this by destroying the invaders about to reach a side
- a bonus invader passes by in the background from time to time
- the invaders are firing too
How much of the experience can be translated? That is the question.
You probably already know this game:
http://www.ics.forth.gr/hci/ua-games/access-invaders/
A version of the game adapted to suit non-visual gameplay. Its main characteristics are the following:
* There is only one group of aliens with a single column of one or more aliens.
* The aliens do not fire against the player – the player's “lives” counter is omitted.
* The player can fire against the aliens, but only two bullets can be concurrently active.
* The game is over only if an alien touches the ground.
* The background is not drawn.
* There are no protective shields.
* Score changes and interaction with the user interface provides audio feedback.
* The spaceship emits a spatial sound, so that its position can be inferred acoustically.
* The group of aliens also emits a distinctive “sonar-like” sound.
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