Please upgrade the android version.
Few errors. Trying to download the first and last entry causes the app to crash. The title displayed when you download a song is the entry above. So is the folder name being created in your Music directory.
The app tends to freeze when you press the Play button. And the app randomly crashes from time to time.
Would've been nice if you could look into these bugs.
Here's the build I currently have on my phone. Not sure if there are newer ones
http://www.filedropper.com/dd