Ahhh, just had the idea to show the controls "T shaped" orientation on screen, which would help to figure out better what are the next set of keys.
For example, if you get the same orientation as WASD (an upside down 'T'), it means the first row of keys on your keyboard (QWERTYUIOP), if used, would necessarily go up. If you get a 'T' rotated 90º to the left or right, you know up/down will be in the keys in the middle (ASDFGHJKL), etc ;)
As soon as the entries are judged and I can upload a new version of the game with this, I will :)