BAM main features include machinery, weaponry, and bossfights, as well as some aspects in storyline, automation, QOL, and adventure.
BAM adds a unique progression in the sense that the player can literally unlock creative mode in pure survival and can even get operator commands by defeating the final boss. Each boss the player defeats grants them an Aspect of creative mode: like no hunger, flight, instamining, and invulnerability, until eventually, the player unlocks creative mode itself and later operator commands.