Improve access for audio users

[gavinhenderson]

Currently the screen reader access is rubbish. The game is also mostly built with Canvas which makes it really hard to explain whats on the screen to a screen reader.

We need to be able to explain to audio users how the game works and how they play it. Once they are in the game, the audio cues should be enough. We might want occasional updates on their progress.

Option One

One potential option suggested by @michaelritson would be to tell screen reader users to turn off their screen reader. Then we take over with our own audio clips explaining the game.

We could add a hidden element that screen readers play after loading that says 'Please disable your screen reader. Press any key to start the game, a video will play explaining how to play.' Then we add audio to the video introduction that plays. This seems like the best option

Option Two

Build a shadow UI that is screen reader accessible.

Option Three

Completely rebuild the game with an accessible UI (not canvas). Probably too dramatic