It's great
I've been using this quite alot rather recently mainly because of the filter function.
It's wonderful.
Gotta take a couple of points off because you can't favourite songs, there's this big empty space in the ad-free version, and you cannot go back to a previous song. Now that one gets on my nerve, when I skip a nice song by accident or when an awesome song ends, I can't go back. Neither can I loop it.
And needless to say, you gotta work on the design a little.
I should probably be subtracting more points because of the lack of function, but I love your filter too much, so I'll leave it at 8.
Can't wait for a newer and improved version!