The final two endings are uncovered in the latest update to Cave Digger 2: Dig Harder.
One new ending finishes the story that the in-game comic started, how Clayton destroyed the civilization of the Elder Lizards and killed their King. Now comes accountability, and maybe even absolution.
The other is a fun one about Chompys, the living chests who for inexplicable reasons have invaded the Cave Digger world. Some creatures are best kept on a tight leash, but now it is too late as you will see!