I had the first play test of Carpoon's volcano level the other day, and while it confirmed my guess that the lava balls were tough to notice, it also showed that there had to be more targets for lava other than the "recycling centers."

Starting out, here's some work in progress on the camera to include other objects than the players from time to time. Having a smooth camera transition   from varying amounts of objects was thanks to a line of code I saw in a Spaun Spalding GameMaker tutorial that was similar to:

cameraX += (cameraTargetX - cameraX)/cameraSpeed;

For the multiple targets, I'll have to avoid the player spawn points as I had that earlier and the result sometimes ended up as a player respawning and dying each frame.