Doesnt work in full. It could have gotten 5 stars if not that!

I purchased this app and it shows that I dont get paid features! How come? Neither zodiac, nor heartbeat rate... It shows window which suggests to restore the purchase, after entering apple id code nothing changes! And I couldnt find any "feedback" button to write them directly.

Ann-tar about Flutter | Baby Heartbeat Monitor - Doppler Baby's Fetal Heart Beats in Pregnancy Free Obstetric Stethoscope or Ultrasound when Pregnant, v1.0