Here are some songs that are romantic and dreamy in nature, similar to "Je te veux" and the "Howl's Moving Castle" theme:

"La Vie en Rose" by Edith Piaf

"Moon River" by Audrey Hepburn

"Once Upon a Time in the West" by Ennio Morricone

"The Rose" by Bette Midler

"A Thousand Years" by Christina Perri

"Unchained Melody" by The Righteous Brothers

"Endless Love" by Diana Ross and Lionel Richie

"I Will Always Love You" by Whitney Houston

"Dream a Little Dream of Me" by Louis Armstrong

"The Windmills of Your Mind" by Dusty Springfield

These songs are sure to evoke feelings of romance and dreaminess and provide the perfect backdrop for a romantic moment or activity.