One app that goes pretty far into that direction is called "ECO Driving Speedometer":
https://play.google.com/store/apps/d...rs.speedometer
You can choose the sensitivity between 1 (high) to 30 (low) and can define when you get warned. Not tested it that much yet. With the app you can't collect points, but you can set some alerts, for accelerating or braking too hard.
One major disadvantage for me personally is, that you can only use it in landscape mode.
The others apps I tried were not that good.
"EcoDrive Free Speedometer"
https://play.google.com/store/apps/d...w.ecodrivefree
"Tronik Eco Driving" (polish language)
https://play.google.com/store/apps/d...nik.ecodriving
"OSeven"
https://play.google.com/store/apps/d...en.safedriving
"EcoDrive" (french language)
https://play.google.com/store/apps/d...e.ats.ecodrive
"SmarterDriver" -
https://play.google.com/store/apps/d....smarterdriver
"My Ecodrive"
https://play.google.com/store/apps/d...xis.myecodrive