Well it's true that the gyroscope does make for very fun gameplay in ios titles since it lets games use types of analogue movement not usually possible on a pc game, and if your still planning something in terms of a rhythm action game the gyros could actually rock since moving the phone around when instructed could make for some very fun challenges, eg, imagine a flamenco themeed level where you had to shake the phone like maracas, or a hard rock level where you had to raise the phone to do an air guitar .
Unity I confess has had problems with access before. it's actually a shame since the Ios interface in itself has so much assistance for vo that other systems lack, even properties of on screen elements to speak information to vo when the "speak hints" for vo is turned on (as it always is), which can be used for everything from explanati ons of mechanics to showing statistics.
Then however we have people creating game engines which are down right terrible with access, unity being a prime contender, indeed a recently funded kickstarter campaign for a game ended up having to pay all their blind customers money back since the engine they're using can't be made accessible.
Unity has been used to create accessible games in the past, but I don't think it's been an easy process and has required some rather specialist intigration, still, good luck, and as I said we'll be glad to post some news about the game when things get rolling.
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