I love all of the little details about the game too, like flipping over tables to create strategic cover; quick warp points so you can instantaneously teleport
around the floors and lessen the amount of backtracking; achievements that actually require dedication and skill to complete; secret areas and side missions that are well thought out and integrated with the game mechanics;
gear based
around classic
gaming and pop culture references (for example a light gun that shoots a Duck Hunt duck with the last bullet of every clip); and since the Supply Drop update, the all - important option to save and quit between floors.