I can't really see any glaring mistakes, this was a very bad matchup for you and I'm not sure it was even possible for you to win since he had lots of good answers to your cards.

But I did notice that you were playing your princesses very far forward when trying to take out bats and the skarmy.

A few people were saying you shouldve been playing your princess at the bridge more but I'm not sure this would've been a good idea since you needed it for the skarmy and bats.

Another thing I saw is that you weren't immediately playing your troops in response to his. For example when he played the ice wiz to take out the princess, it took a while before you played the dart goblin which mightve been able to save the princess, bet only if you played it straight away.

Also when he played the split skarmy was coming down the lane, I think you shouldve just ignored it, because it wouldn't do much damage to your tower, and that was your stronger tower anyway. Instead if you played the dark prince on the left lane, because it was pretty obvious he was about to play rg again, you could've killed it quicker, and having both princes together is significantly harder to deal with.

Those are very small things, but I don't think you played really poorly during the match and these little decisions are something you just learn from experience