very interesting game!
Ideas: If when you die, you can either change your last move to avoid the skull or take the skull with the penality (your choice then being fixed until the end of the game) it creates a new dimension to the game. That would be less thematic maybe, but now, you don't have choices in this game... Or force the player to go over the skulls in the same order but letting the rest of the exploration free? I tell you that because I found myself optimizing the fun out of the game by doing boring straight line so I can remember my path with more ease (hahaha sorry)