Little Apple (LittleSax - A simple type of Saxophone. Like Xaphoon, Tupian, Pocket Sax)

This is China 2014 Divine Song. This song is played by LittleSax. Its web site is: LittleSax - A simple type of Saxophone. The mouthpiece of LittleSax is the same as alto sax, sax reed used. I’m LittleSax inventor and manufacturer. I like music very much. but I am not a music professional. This playing level is limited, I hope to get some suggestions. Thank you! 谢谢!