Understandable! Thank you for playing and sharing feedback.
The control illustrations are an experiment I am trying. You are right, the "second key" is not on every one's keyboard, I decided to draw it small to hint that. Unfortunately, Godot in the web export doesn't have anyway to know about the keyboard layout, making it an issue for communicating physical keys. The most reliable way would be to use character codes and allow the user to change everything, but that is a huge amount of work for a game jam, and having to configure the controls when starting the game as a new player would probably be a confusing experience in more complex games.
I settled for arrow keys + Z and X because this is my preferred way to play platformers on the keyboard and a common pattern on most emulators and fantasy consoles. I could add WASD + Space and E as an alternative since they don't compete. I'm curious, what is your preference 😀?