Looks good, you could try adding some dark red to the lava instead of having a bright red lava that burns your eyes. Also you might want to fix the jagged lines near where the score is... Possibly the clouds? Or is that a cave wall? Might want to add some details to the background too.

hey good idea but you could make the texture of the background and the lava look better by adding some tiles.

other than that, it looks good