JOIN AND UNDERMINE is my entry for Wizard Jam 6. It's named after episode 26 of the Important If True podcast. The subtitle is "Always support the Danger Layer" - the title of episode 86 of the Idle Thumbs podcast.
This game is still in heavy development but most of the core features I had planned are in. Here's what you can do:
run around, jump, do cool wall-slides and hops
mine blocks using your rad laser
pick up minerals you've mined from the blocks
deposit the minerals in the base at the surface
spend your collected goods on upgrades
encounter the Danger Layer and potentially get crushed by falling blocks
get stuck underground and never get back to the surface
About that last point: You can sacrifice your inventory's contents and teleport back to the surface by holding T for a bit. If you mined out all the blocks around your base's entrance though...well, don't do that.
Also: There's no goal right now, no end state. Just play until you get bored.