Use bright colors to make your room pop
The gist of Muji sg could be for a simple and minimalist look but not in lackluster. Make your place homely by using furnishings of pastel shades. And put up a plant to make it look simple and aesthetic.
Make the use of a slidable door or a room divider.
One of the cons of styling an HDB flat is the lack of space as they are getting smaller day by day. You may need to have a knack for styling a tiny room and this can be done by putting up a room divider. This helps in creating an illusion that you have two spaces rather than one. Hence making the flat seem more spacious.