Saish2000

I’ve been searching for this 1 game for so long I cant find it it was an old game I used to play in 2006 it started as 2 children in park boy and a girl suddenly a guy appears from a portal and takes the girl with him the boy follows.after cutscene we are in a forest playing as the boy side view jumping game there were trees and mushrooms around and I think the boy was wearing a red shirt that’s all I remember does someone have any idea