OMG i love this! excellently done, good job!
One little critic is that I didn't notice that there was a timer until i was almost done with the first fossil, and i was taking my time. I would make it a tiny bit more obvious with either having it at the top center, or when the game starts have it grow from the center of the screen before lerping it to it's actual position. That way it's in the player's mind from the start