Very cool! Couple things. The input history on the left sometimes skips directional inputs; I think this happens when the direction + F happen on the same frame. Also it appears 36236F (i.e. not starting with a full 236) is valid for super; not sure if that’s intentional.
It might be necessary to include jumping, because part of what makes flash kick and SPD tricky to master at first is the fact that if you leave too much of a gap between 8 and F, you get a jump.
What would be really cool to see is some kind of real “training” functionality that gives you deeper feedback. For example, if you turn on the timer display for fireball, you could do a sort of rhythm game-type display that shows how close the inputs were to the correct timing. That way I can see, ah, I’m a bit slow on the 36 part.