Need some Feedback on a new Mashup

Need some Feedback on a new Mashup

Hallo togehter,

First of all this Forum is great and i hope i will find some help here.
I am new into creating Mashups and Remixing Songs.
One of my first productions is done.
So now i need some Feedback and hope you can give me some advice and tipps how to get better, because i know its probably not perfect jet.

Here is the song: