You absolutely nailed the atmosphere you were going for with this OST :3 That cinematic trailer theme is beautiful and definitely does what you described as it feels wholesome & sweet, but also gets you in the mood for frolics and adventure!
I really like how the Title Track sounds right after the trailer theme. It extends that sense of adventure and amplifies it with more energy, all while maintaining a sense of innocence and good times to come with friends :3
The whole thing is really sweet and carefree. I agree with wt64 about the Ghibli vibes because I got that feeling too!