The game has a great concept and idea. I think it needs a tutorial, it' not really straightforward but otherwise it's really well made. I liked the sounds and the arts. Maybe you could add a button with which you can speed up the lava so that at certain moments you don't have to wait for the screen to catch up.
Overall good job and really enjoyed the idea as well as the ui. Might be a cool "survival" game to play on the phone