In its current build state, the $13 game from the studio that created Ridiculous Fishing and Super Crate Box, includes four playable worlds, seven characters, two boss battles and lots of weapons, skills and "randomly generated goodness."
The final version will include at least four more worlds, "an undefined number of secret worlds to explore," more skins, sound effects and be shiny like a copper penny. OR ELSE! As with all Early Access games, it's best not to play unless you're willing to be part of the bug crushing process. And these are bugs created by fallout, so watch out!