Icons that are what you asked for

BEFORE
AFTERBefore, ordinary red hearts. After, crewmates, with the visor still right on the half heart.
A theme from a name

BEFORE
AFTERBefore, a pink tint. After, striped candy hearts, candy canes for food and a rounded hotbar.
A hotbar that fits the style

BEFORE
AFTERSeparate slots, gold corner brackets on the held slot, slim bars and gold icons.

BEFORE
AFTERBefore, empty hearts turned into navy blobs. After, a glass hotbar, and empties you can still read.

BEFORE
AFTERNo tray at all: a faint well and a mark under each slot.
Small asks, done exactly

BEFORE
AFTERBefore, ordinary hearts. After, hardcore hearts, and the rest left close to vanilla.