Did you use the Sonic Rings noise? xD I got a 6 initially (miniboss, which I didn't know how to fight, so it killed me), then a 2 (gem hazards room), then a 3 (moving platforms, which I fell and died on). I didn't see a leaderboard, but I saw the hidden gem you put in the hazards room, very clever design! Overall the game style reminded me of Limbo.