Very cute and fun game. Disappointingly short, but thats game jams for you.
That said, I used to do video game beta testing (QA in modern terms) and the inexperience shows. The "X marks the spot" puzzle? Don't do that. Don't ever do that. If this was a full sized game, the player base would go through the entire game clicking on every "X" in the game thinking its another puzzle. It wouldn't matter if it was a store bought asset, a stretched out texture asset or a generic checkered pattern. You taught the players to check the "X" and thats what they're going to do.