How To get Lollipop Heads Up notification -:
1) You Need A Rooted Phone and Xposed Installer
2) Now Go To Xposed installer >> Select "Downloads"
3) Now Search " Heads Up Notifications"
4) Install The Latest Version
5) Now again Go To Xposed Installer >> Select "Modules"
6) Tick (√) On "Heads Up Notifications"
7) Now Reboot / Restart Your Phone
8) Open " Heads Up Notifications" And Start Configuring.
9) That's It! Now Enjoy Lollipop Notifications in kitkat.