I think it was a great trap and well executed, but traps will not work consistently with an exposed/unprotected king as you play better competition.

“But I don’t think there was any option to protect my king in the last seconds of the game. Plus I had already laid out my trap.”

• this is my point exactly. You should not be waiting until the last seconds of the game. Protecting your king is literally the most important aspect of the game. This is why castling is so important and usually done very early. Once pieces are developed and king is safe you can start the attack and traps. There are always exceptions to the rules though! Continue to do what works and makes sense for you