Sound Effects are from: https://freesound.org/

Musics are from: https://opengameart.org/

Musics used:

Happy BGM - Syncopika

Happy Tune - Syncopika

Helium Plains - Gurgie

Sadness - Joseph Gilbert / Kistol

Link to the artists:

https://opengameart.org/users/syncopika

cynicmusic.com

pixelsphere.org