There have been a lot of good suggestions here. Familiarity with the cards will definitely help. For the timer, direct/friend challenge games and not games against Sparky don’t have a timer.
On general assistance for the visually impaired, please let me know more about what would help you here (and the things currently there that help; your comment in sound cues is already making me think about ways we might be able to make them more useful). I’m really interested in anything you could share on this (either comment here or PM me if you’d rather). We definitely want to make the game accessible to all players, but it’s hard/expensive to get good insight into every different case.
Glad you’re enjoying the game, and please tell me more about how we can help.