I played the survival mode and I gotta say it looks impressive!
I wanted to give you two suggestions that would make the game better.
1: When mushrooms were engulfed with water, they would withstand it. Normally, the mushrooms should have been washed away. I don't know if they do the same for lava, but if water engulfs the mushrooms, the mushrooms should be destroyed automatically.
2: When any collectible blocks falls into the lava, those blocks should be disintegrated. It's a hassle for when I'm trying to replace lava with blocks as the collectibles blocks the way.