Thanks for letting me know that the game is a bit more challenging than you would expect!

I think the difficulty should be related to learning the characters and not switching buttons! as a result I am going to add a preview of what is coming up to make the game easier to play (as far as reaction times go). Hopefully this will solve any issues people are having.

I have also removed the tutorial from the Katakana mode as it was unnecessary, thanks for your feedback so far!

I have been working on the update since the game went live, and hope to have it finished in the next 24 hours or so!