Just to bump this, I also found this great tutorial by Fronne:
https://www.scirra.com/tutorials/1153/m ... ces/page-1
It is a combination keyboard/leaderboard tutorial. The great thing about this is that you can change the keyboard graphics to whatever you want, so that it'll fit the style of your game.
Anyway, just figured this might be useful for anyone who stumbled on this thread later on.