Lol! I lost track of the coin after 6 secs only to find it back at the eleventh second! It warped!
I personnaly think that, even tough the first palm is a bit flashy (after 4 or 5 replays

), the whole sequence is well executed. A bit more practise and I'm pretty sure it can fool anyone who hasn't the capacity to "rewind" it

! Don't forget eye contact and talking when performed live
(P.S: For a beginner, as you describe yourself, this is a quite hard effect! You learned magic the hard way, congrats and cheers!)
Tips for improvement:
1: Watch for the position of your left hand on the first move
2: Smoothen it up a bit. Don't forget that every moves should have a purpose to the audience. In this case, the purpose is (I suppose) rubbing your hand to show they are empty. Watch yourself in a mirror rubbing your hands (can't believe I just wrote that....) and try to look the same
3: Keep it up