The bad - I think some background music would be good
The good - I like how you got the rippling waves of the lava and how it rises, also like the dust particles when the player runs and I like how he leans forward and has a great feedback with the sounds when he lands and even when he dies too. The mix of solid and jump through platforms is good fun and the blobs of lava are a good addition too. My high score is 97, but feel like I could do better with just one more try...