Without a doubt interesting, it has potential. My humble advice is that: When you make a game where the character has the mirror effect if the position of the mouse in "x" is higher or lower than that of the player or any character, do not remove or add the mirror effect when pressing for example, the left or right arrow. Just because of the position of the mouse, in my opinion it is better. Success. Another detail, if you can use the mouse to perform the actions that you do by pressing the space key, better use it, instead of space, it seems more comfortable and it gives the mouse usefulness.
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Thank you for the feedback. At one point you could click with the mouse and it performed the same action as Space but it suddenly stopped working and I don't know why. I didn't change anything. I thought maybe it was deleted from my code once Godot crashed but it was still in my code and I really don't know why it stopped working. But I will try to track down the bug and update the game after the voting
I've fixed the thing with the mouse click. You can now click left or right mouse button as it was always intended. I'm using an invisible button that is always at the same position as the mouse. It isn't the best solution but it works and the player won't notice it.
I've also changed the mirror effect a little bit, it is now a subtle eye movement to the mouse.
The update will be available after the voting ended