Thank you for your detailed review!
The problem with the keyboard representation is that 1) it would have given too many hints for the player and 2) not everyone has the same keyboard layout (AZERTY, DVORAK, ...). We also wanted to let the player discover that multiple keys can be binded. The idea that you should not have to press "Add key" each time is actually pretty cool!
About the reminding key being consumable, it is actually a bug: we wanted the "game over" to take place when the player doesn't have any more action available, namely when they forgot to have a way to rebind. However, it didn't work in the final build.
Then again, thanks for the review- I hope you enjoyed the game~