To me it feels like the ground is floating in the air. It feels disconnected from the lava and the ground doesn't look attached to anything right now. Am I the only one who gets this feeling?
I really love your latest graphics, just need some attachment of the ground into the lava. I think the outline colour on the bottom side is actually doing too much to separate it from the lava. Perhaps a more dark reddish instead of dark greyish?
Right now this is what I imagine it to be (kinda):
Here's some really sloppy edits:Kinda waterish shadow:

With yellow lines which you already use on the spikey thingies which lie in the lava. Why not use that on the ground aswell?: