App Installer (Apk Installer)

This is my android application, it was published 1 month to Google play. I need your reviews and feedback to improve it.
Introduce:
★ Easy to use app to find apk files on your phone
★ Supper light, fast and usefull for installation Non Google play market
★ In top 20 apps in Italy
★ Download APK Installer free and have fun
How to install apk file to android phone?
You need an app can use for scan all apks in your device, then install them.
"APK Installer" make your android installation become more easier.
FEATURES
- Scan apps from SD card
- Install apps from SD card
- Delete apps from SD card
- Batch install & delete
- Filter apps by name
- Various sort mode
- Send apps to friends by email
- Search apps in Google Market
- Efficient cache mechanism
- Multi-language support: English - Deutsch - Italiano - Portugu

 

And this is the video of it
https://www.youtube.com/watch?feature=player_embedded&v=DCVBnQVngn0

 

Hi guys,
I need your feedback and reviews about this app.
Thanks