[pimlottc]

The "up/down" arrows are a bit confusing, I don't think it's self-evident whether "later in the alphabet" would be considered "higher" or "lower".

"left" or "right" might be clearer, at least for English, and it would map directly to the range bar visualizations beneath each letter.

[ludovicianul]

Higher = right = after, Lower = left = before. Once you play some games, it will become more natural. At least this was the feedback from friends playing the game.

[pimlottc]

But why use two different axis (down/up, left/right) for the same thing when you could be consistently just use left/right?

[ludovicianul]

A combination of visual identity of the game, with the Highs and Lows and helping players visualise with the before and after. I’ve implementarea the letters fading in each position on the keyboard, so that you only see the letters that are valid for that position.