Does the order not matter?
Edit: oh God. I did massive overthinking. I thought I was supposed to notice the shield lying in the water and act like it was still in the empty place on the fountain and that there would be some clue as to with which symbol to start and that I'd then have to enter all 4 in the correct order.
Anyway, good job on the game! Would've loved to have more puzzles in there and I believe people already told you about the mouse sensitivity being a bit difficult to handle :)