This is the 12134th most frequent Swedish word.
roligare
"Roligare" means "more fun" or "funnier" in English.
Here 'roligare' is used as a comparative adjective to indicate that doing things together is more enjoyable compared to doing things alone.
Det blir alltid roligare att göra saker tillsammans.
It always becomes more fun to do things together.
In this case, 'roligare' signifies making the environment more attractive or amusing by adding decorations.
Hon försöker göra sitt rum roligare med några nya dekorationer.
She is trying to make her room more fun with some new decorations.
Here, 'roligare' is employed to compare two subjects, implying that someone's sense of humor or entertaining nature stands out.